Articoli di riviste: "Roots (Botany) Diseases and pests"

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Summerell, Brett, e Edward Liew. "Phytophthora root rot: its impact in botanic gardens and on threatened species conservation". Sibbaldia: the International Journal of Botanic Garden Horticulture, n. 18 (21 febbraio 2020): 89–104. http://dx.doi.org/10.24823/sibbaldia.2020.290.

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Phytophthora root rot is one of the most devastating diseases of perennial plants worldwide, affecting plants in food production, amenity plantings and in natural ecosystems. The impact of these diseases in botanic gardens can be substantial and can affect how a site may be used for months and years ahead. Management is critically dependent on avoidance of the introduction of the pathogen and effective hygiene protocols are key to achieving this. Additionally, botanic gardens have a key role to play in protecting plants and enhancing conservation outcomes through surveillance, education and ex situ conservation programmes, as well as through the recognition that they can be critical as sentinel sites to detect new incursions of pests anddiseases. The impact of several Phytophthora species on the in situ and ex situ management of the critically endangered Wollemia nobilis (Wollemi pine), which is highly susceptible to phytophthora root rot, is used to highlight the need to ensure management of these pathogens is a critical component of threatened species recovery and management.

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Martyn, R. D. "Where will the next Norman Borlaug come from? A U.S. perspective of plant pathology education and research." Plant Protection Science 45, No. 4 (27 dicembre 2009): 125–39. http://dx.doi.org/10.17221/22/2009-pps.

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Plant diseases can be traced back almost as far as recorded history. Numerous ancient writings describe plagues and blasts destroying crops and modern civilization still faces many plant disease challenges. Plant pathology has its roots in botany and notable scientists such as Tillet, Prevost, and deBary already had concluded microscopic organisms could cause plant diseases before Robert Koch established the rules of proof of pathogenicity with sheep anthrax. Plant pathologists can be credited with helping improve crop yields and food production throughout the world. However, at a time when there are increasing challenges to crop production, some that potentially may increase the severity or distribution of plant diseases, the training of future plant pathologists appears to be declining, at least in the United States. The ability of the U.S. Land Grant University (USLGU) system to attract and train future generations of plant pathologists may be at risk. Recent data from university plant pathology departments collected by The American Phytopathological Society (APS) documents a decline in the number of students completing advanced degrees in plant pathology, departments with fewer faculty with a diverse expertise in applied plant pathology, fewer stand-alone, single discipline departments of plant pathology, a reduced ability of many departments to offer specific curricular aspects of plant pathology, and a demographic profile that casts an ominous prediction for an unusually large number of faculty retirements over the next decade. The impact of these factors could be a shortage of highly skilled, applied plant pathologists in the U.S. in coming years. The affect also may be felt globally as fewer international students may receive pre-doctoral and post-doctoral training in plant pathology in the U.S. as faculty retire and are not replaced. On the other hand, this likely will create greater opportunities for universities around the world to take leadership in many aspects of plant pathology education. While a decline in students and young faculty trained in applied and field-level specialties of plant pathology (mycology, bacteriology, plant nematology, forest pathology, epidemiology, etc.) is occurring, those trained in the cellular and molecular host-pathogen interactions specialties appear to be increasing. Many plant pathology faculty hired at USLGUs in the last decade are trained in molecular biology and received their Ph.D. degree in a field other than plant pathology. They are now applying those skills to research numerous aspects of host-pathogen interactions of model pathosystems. A shift to a greater research emphasis on molecular host-pathogen interactions over the last decade is evidenced by the number of research articles published in the three APS journals; Plant Disease, Phytopathology and Molecular Plant-Microbe Interactions (MPMI). From 1985 to 2007, there has been a decline in the number of articles published in Plant Disease (–29%) and Phytopathology (–36%) and a steady increase in those published in MPMI since its inception in 1990 (+111%). With new research tools come new research questions. The tools of molecular biology have allowed us to look deeper into questions than ever before and provided us with a perspective not before seen. As we dissect and decode the genomes of the world’s most notorious plant pathogens we get closer and closer to alleviating the global losses and human suffering caused by plant diseases. New “designer crops” with engineered traits for drought and cold tolerance, pest resistance, increased levels of micronutrients, healthier oils such as omega fatty acids, and plant-derived pharmaceuticals are all on the horizon. Research in the future likely will focus on new problems, traditionally seen as outside the discipline of plant pathology. The impact of climate change on plant diseases will be significant. As many parts of the world become warmer and drier some plant diseases likely will increase in severity. Pathogens are likely to migrate and survive in more northern latitudes greatly expanding their range and diseases exacerbated by abiotic stresses such as drought and salinity will increase. Plant pathology will continue to evolve as a multidisciplinary science. These changes will open up many new research opportunities. Plant pathology will play a bigger role in global food security. Research into the molecular and cellular interactions of symbiotic and endophytic organisms will help provide answers to food-borne illnesses caused by E. coli and Salmonella and how these and other human pathogens become established in plants in the field. Plant pathologists will team up with biomedical and aeronautical engineers, nanotechnologists, and computer scientists to develop microsensory technology to detect the introduction and spread of pathogens for biosecurity, diagnostics and epidemiological modeling purposes. Traditional areas of plant disease management and the use of biologicals for disease control also will benefit from a better understanding of the molecular and cellular processes and the similarity of virulence mechanisms and pathogen effectors between plant, insect, and vertebrate pathogens likely will bring new insights into human diseases. And last, but not least, there likely will be a resurgence in plant disease management and epidemiological research as the world’s dependence on biofuels increases and results in new diseases on intensively cultivated plant species used for biomass production.

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Ondieki, Joseph Atanga, Peter Sirmah e Joseph Hitimana. "Incidence of Pests and Diseases in Tree Nurseries and Plantations in Kimondi Forest, Nandi County, Kenya". East African Journal of Forestry and Agroforestry 3, n. 1 (5 marzo 2021): 18–28. http://dx.doi.org/10.37284/eajfa.3.1.287.

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Increasing demand for wood is putting pressure on forest resources that are equally under threat from insect pests and diseases. Reported average annual forest loss stands at 0.2% globally, 0.8% in Africa, and 1.6% in Kenya. To meet the increasing demand for forest products in Kenya, the government and private sector have established plantations of non-native tree species dominated by Eucalyptus species, Cupressus lusitanica, and Pinus patula. To ensure successful forest plantation establishment and management schemes, there is a need for sufficient knowledge and understanding of tree growth conditions and threats including pests and diseases. This study aimed at determining the incidence of plantation and tree nurseries in Kimondi Forest, Kenya. Tree plantations were mapped into 2.5 Ha rectangular portion transects parallel to the forest roads. In randomly selected portions, observations were carried out for disease and pest signs and symptoms on various tree parts (leaves, stem, roots, fruits, and twigs). In the tree nurseries, 3 m × 1 m rectangular quadrants were placed on seedling beds and similar observations were made. Collected data indicated a high incidence of nursery seedling pests (5.3 % leaves and 5.1% stems) on Eucalyptus species and least on P. patula (2.4% leaves and 3% stems). Higher incidence of plantation pests (35.0% leaves of Eucalyptus sps.) and least on P. patula stems (1.2%) were recorded. On the other hand, twelve (12.0%) of C. lusitanica and (1.8%) Eucalyptus species plantation twigs were infested by pests. A high incidence of nursery seedling disease (9.8%) was observed on C. lusitanica leaves and least on P. patula stems (3.6%). Higher incidence of plantation diseases (32 %) on leaves of Eucalyptus sps. and least on C. lusitanica stem (1.4%) was recorded. In both tree nurseries and plantations, roots and fruits remained free from pests and disease. Major tree pests and diseases identified in Kimondi forests include (Human, wildlife, livestock, Cinara cupressi, Gonipterus scutellatus, Pinus pini, and Leptocybe invasa) and (damping-off, Fusarium wilt, Botryosphaeria canker, cypress canker, and Mycosphaerella spp.) respectively. These results suggest a need for regular monitoring and intervention measures to control pest and disease infestation in the Kimondi forest.

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Beal, P. R., e D. C. Joyce. "Cutflower characteristics of terminal flowering tropical Grevillea: a brief review". Australian Journal of Experimental Agriculture 39, n. 6 (1999): 781. http://dx.doi.org/10.1071/ea98181.

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Summary. The large and colourful cut inflorescences of the terminal flowering tropical Grevillea species and hybrids are considered by enthusiasts to have potential as a cutflower crop. Developing understanding of the characteristics of grevillea inflorescences is collated in this review article. Botany, quality, cultivars, production and marketing, physiology and biochemistry, growth and development, flowering regulation, senescence, postharvest losses, pests and diseases, loss reduction measures, and use of floral preservatives for cut inflorescences are discussed. This overview of current knowledge provides a platform for future research and development on this novel native Australian flower.

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Maroyi, Alfred. "Albizia Adianthifolia: Botany, Medicinal Uses, Phytochemistry, and Pharmacological Properties". Scientific World Journal 2018 (20 settembre 2018): 1–18. http://dx.doi.org/10.1155/2018/7463584.

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The bark, leaves, and roots ofAlbizia adianthifoliaare highly sought after in tropical Africa as herbal medicines. Therefore, the aim of this study was to review the botany, medicinal uses, phytochemistry, and pharmacological properties ofA. adianthifoliaso as to provide baseline data required for evaluating the therapeutic potential of the species. Information on the botanical profile, medicinal uses, phytochemistry, and pharmacological properties ofA. adianthifoliawas undertaken using databases such as ScienceDirect, SciFinder, Pubmed, Google Scholar, Medline, SCOPUS, EThOS, ProQuest, OATD, and Open-thesis. Preelectronic literature search of conference papers, scientific articles, books, book chapters, dissertations, and theses was carried out at the University library. Literature search revealed thatA. adianthifoliais used as purgative and herbal medicine for diabetes, eye problems, gastrointestinal problems, haemorrhoids, headache, neurodegenerative disorders, reproductive problems in women, respiratory problems, wounds and pain, skin diseases, sexually transmitted infections, and ethnoveterinary medicine. Phytochemical compounds identified from the species include apocarotenoids, chalcone, dipeptide, elliptosides, essential oils, fatty acids, flavonoids, histamine, imidazolyl carboxylic acid, prosapogenins, steroids, triterpene saponins, and triterpenoids. Pharmacological studies revealed thatA. adianthifoliaextracts and compounds have acetylcholinesterase enzyme inhibitory, anthelmintic, antiamoebic, antibacterial, antimycobacterial, anti-sexually transmitted infections, antifungal, anti-inflammatory, antioxidant, anxiolytic, and antidepressant, cognitive-enhancing, haemolytic, hypoglycemic and antihyperglycemic, immunomodulatory, and cytotoxicity activities. Detailed studies on the pharmacokinetics, in vivo,and clinical research involving compounds isolated fromA. adianthifoliaand extracts of the species are required.

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Bouraïma, Amoussatou, Rachidatou Sikirou, Bruno Zocli, Vincent Ezin, Sètondji Alban Paterne Etchiha Afoha, Léopold Simplice Gnancadja, Adolphe Adjanonhoun e Kerstin Hell. "Pests and Diseases Associated with Yam Bean (Pachyrhizus erosus) Cultivation at Farmers’ Levels in the Central Region of Benin". Biosaintifika: Journal of Biology & Biology Education 12, n. 2 (1 agosto 2020): 132–39. http://dx.doi.org/10.15294/biosaintifika.v12i2.23771.

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Roots and tubers are one of the most important crops that provide food security in West Africa. Thus, Pachyrhisus erosus with its various potentials, is planned to be introduced in Benin to improve the nutritional quality of the population. Prior to that, this study aimed at assessing pests and disease of P. erosus in the agroecological conditions in the central parts of Benin. Conducted at experimental field in Savè during two consecutive years, experiments were laid in a completely randomized block design with 4 replications and three treatments including EC 533 and EC Kew cultivars of P. erosus and cowpea variety named Kpodji-Guèguè. Results showed that the major pests collected from P. erosus namely Ootheca mutabilis, Medythia quaterna, Piezotrachelus varium, Megalurothrips sjostedti and Brevipalpus phoenis were not so far reported in it. Compared to cowpea, pest’s infestation and their damages were lower on P. erosus. Infestation severity on leaves and the percentage of perforated green pods ranged from 0.7% to 3% against 0.8% to 88.9% and from 12.5% to 16% against 57.2% to 64% respectively on P. erosus and cowpea. Cercospora disease caused by Cercospora canescens and yam bean leaf blight caused by an unknown fungus were observed. Cercospora disease affected cowpea and P. erosus while yam bean leaf blight affected only P. erosus. This study provides additional data on pests and diseases associated with P. erosus worldwide and alerts farmers regarding their management.

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De Nardi, Barbara, René Dreos, Lorenzo Del Terra, Chiara Martellossi, Elisa Asquini, Patrizia Tornincasa, Debora Gasperini et al. "Differential responses of Coffea arabica L. leaves and roots to chemically induced systemic acquired resistance". Genome 49, n. 12 (dicembre 2006): 1594–605. http://dx.doi.org/10.1139/g06-125.

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Coffea arabica is susceptible to several pests and diseases, some of which affect the leaves and roots. Systemic acquired resistance (SAR) is the main defence mechanism activated in plants in response to pathogen attack. Here, we report the effects of benzo(1,2,3)thiadiazole-7-carbothioic acid-s-methyl ester (BTH), a SAR chemical inducer, on the expression profile of C. arabica. Two cDNA libraries were constructed from the mRNA isolated from leaves and embryonic roots to create 1587 nonredundant expressed sequence tags (ESTs). We developed a cDNA microarray containing 1506 ESTs from the leaves and embryonic roots, and 48 NBS-LRR (nucleotide-binding site leucine-rich repeat) gene fragments derived from 2 specific genomic libraries. Competitive hybridization between untreated and BTH-treated leaves resulted in 55 genes that were significantly overexpressed and 16 genes that were significantly underexpressed. In the roots, 37 and 42 genes were over and underexpressed, respectively. A general shift in metabolism from housekeeping to defence occurred in the leaves and roots after BTH treatment. We observed a systemic increase in pathogenesis-related protein synthesis, in the oxidative burst, and in the cell wall strengthening processes. Moreover, responses in the roots and leaves varied significantly.

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Gurr, Geoff M., Jian Liu, Anne C. Johnson, Deane N. Woruba, Gunnar Kirchhof, Ryosuke Fujinuma, William Sirabis, Yapo Jeffery e Ramakrishna Akkinapally. "Pests, diseases and crop protection practices in the smallholder sweetpotato production system of the highlands of Papua New Guinea". PeerJ 4 (7 dicembre 2016): e2703. http://dx.doi.org/10.7717/peerj.2703.

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Sweetpotato (Ipomea batatans) is a food crop of global significance. The storage roots and foliage of crop are attacked by a wide range of pests and diseases. Whilst these are generally well controlled in developed countries using approaches such as clean planting material and monitoring with pheromone traps to guide insecticide use, research into methods suitable for developing countries has lagged. In Papua New Guinea (PNG), sweetpotato is grown extensively as a subsistence crop and commercial production as a cash crop is developing. We report results from a survey of 33 smallholder producers located in the Highlands of PNG where the crop is of particular importance. Surveys of interviewees’ crops showed high levels of pest and disease impact to foliage, stems and storage roots, especially in crops that were several years old. Weevils (Curculionidae) were reportedly the most damaging pests and scab (caused by the fungusElisnoe batatus) the most damaging disease. Most producers reported root damage from the former and foliar damage from the latter but the general level of knowledge of pest and disease types was low. Despite the apparency of pest and disease signs and symptoms and recognition of their importance by farmers, a large majority of producers reported practiced no active pest or disease management. This was despite low numbers of farmers reporting use of traditional cultural practices including phytosanitary measures and insecticidal plants that had the scope for far wider use. Only one respondent reported use of insecticide though pesticides were available in nearby cities. This low level of pest and disease management in most cases, likely due to paucity in biological and technical knowledge among growers, hampers efforts to establish food security and constrains the development of sweetpotato as a cash crop.

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Bezerra, Gabrielle Alves, Afra Vital Matos Dias Gabriel, Eduardo D. Mariano e Jean Carlos Cardoso. "In vitro culture and greenhouse acclimatization of Oncidium varicosum (Orchidaceae) with microorganisms isolated from its roots". Ornamental Horticulture 25, n. 4 (dicembre 2019): 407–16. http://dx.doi.org/10.1590/2447-536x.v25i4.2046.

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Abstract Sustainable production of orchids may be achieved with the use of symbiotic microorganisms that improve resistance of plants to pests and diseases and reduce the need of substrate fertilization. In this study, one fungus (F1), one yeast (Y1) and one gram-positive bacteria (B+) were isolated from the roots of the orchid Oncidium varicosum and used in the cultivation of protocorms and plantlets obtained from seeds of this species. Cultivation of protocorms in Murashige and Skoog (MS) medium enriched with sucrose and inoculated with microorganisms did not result in better development of protocorms. However, the use of plantlets in the rooting phase in MS medium without sucrose and inoculated with B+ resulted in plantlets with more leaves and roots and longer shoots and roots, suggesting synergism between microorganism and plant when sucrose is absent. The major benefits of co-cultivating plantlets and these microorganisms were observed in the acclimatization in the greenhouse. Plantlets obtained with oat meal agar medium and B+ showed the highest pseudobulb diameter, number of roots, height and fresh weight among treatments. We concluded that the application of rooting-derived microorganisms in the in vitro culture and plantlet acclimatization of Oncidium varicosum is beneficial.

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Syvertsen, Jim, e Yoseph Levy. "Salinity Interactions with Other Abiotic and Biotic Stresses in Citrus". HortTechnology 15, n. 1 (gennaio 2005): 100–103. http://dx.doi.org/10.21273/horttech.15.1.0100.

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Multiple stresses almost always have synergistic effects on plants. In citrus, there are direct and indirect interactions between salinity and other physical abiotic stresses like poor soil drainage, drought, irradiance, leaf temperature, and atmospheric evaporative demand. In addition, salinity interacts with biotic pests and diseases including root rot (Phytophthora spp.), nematodes, and mycorrhizae. Improving tree water relations through optimum irrigation/drainage management, maintaining nutrient balances, and decreasing evaporative demand can alleviate salt injury and decrease toxic ion accumulation. Irrigation with high salinity water not only can have direct effects on root pathogens, but salinity can also predispose citrus rootstocks to attack by root rot and nematodes. Rootstocks known to be tolerant to root rot and nematode pests can become more susceptible when irrigated with high salinity water. In addition, nematodes and mycorrhizae can affect the salt tolerance of citrus roots and may increase chloride (Cl-) uptake. Not all effects of salinity are negative, however, as moderate salinity stress can reduce physiological activity and growth, allowing citrus seedlings to survive cold stress, and can even enhance flowering after the salinity stress is relieved.

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estabrook, barry. "On the Tomato Trail: In Search of Ancestral Roots". Gastronomica 10, n. 2 (2010): 40–44. http://dx.doi.org/10.1525/gfc.2010.10.2.40.

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A profile of Roger Chetelat, the director of the C.M. Rick Tomato Genetics Resource Center at the University of California, Davis. Chetelat maintains one of the largest collections of tomato seeds in the world. Many of those seeds come from wild tomato species that Chetelat and his associates collect on field research trips to the dry coastal areas of Chile, Peru, and Ecuador. Wild tomatoes are tough, versatile organisms that have evolved resistance to virtually all common tomato diseases and pests and stubbornly tolerate extreme environmental conditions. Some boast extraordinarily high levels of sugars, beta carotene, vitamin C, lycopene, and antioxidants. Chetelat has dedicated his career to finding and preserving these genetic riches. Modern cultivated tomatoes are a frail, inbred lot. They all trace their origins to a single, wild tomato plant that underwent a random mutation sometime in prehistory. Because of this genetic fluke, that plant's fruits were plump, juicy, and many, many times larger than the output of its progenitors. Offspring from that tomato were taken away from the Andes and domesticated in what is present-day Mexico, becoming severed from their wild ancestors and the vast pool of genetic diversity that tomatoes had evolved over the millennia. Botanists call this a ““bottleneck.”” It leaves subsequent generations susceptible to disease and unable to adjust to rapid climate changes. The stored wild seeds at the Rick Center enable plant breeders to re-incorporate desirable wild traits into new tomato varieties, literally reconnecting them to their ancestral roots, ensuring that this vast reservoir of genetic diversity will be available when it is needed.

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Castilla-Valdés, Yanelis. "La gardenia: características, usos, plagas y enfermedades y aspectos básicos de su cultivo". Agronomía Mesoamericana 29, n. 3 (1 settembre 2018): 731. http://dx.doi.org/10.15517/ma.v29i3.31461.

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The gardenia (Gardenia jasminoides Ellis) is a plant that is very appreciated in gardening for the beauty and fragrance of its flowers, attractive size and the intense green color of the foliage. In contrast to its ornamental qualities, it is not one of the most used plants in Cuba and other countries, so it is necessary to promote its cultivation. The present review objective was deepening and integrating information regarding the characteristics, utility, main pests and diseases and methods of propagation of the gardenia. The sunny and warm conditions during the day and fresh at night, relative humidity upper than 60% and acid soil, rich in iron, are favorable for this species development. Between the lesser known properties of gardenia, there are the medicinal ones because its extracts have diverse pharmacological effects. Its most common diseases are of fungal origin and provoke the rot roots and foliar spots. Among the pests that have the greatest incidence stand out the insects (aphids, citrus whitefly, coccids, and thrips). Gardenia plants can be propagated by different traditional methods (seeds, air layering, cuttings, and grafting), but the application of in vitro cultivation techniques are an efficient way to achieve this purpose, since it allows accelerated multiplication and production of healthy plants, also, it constitutes an alternative for obtaining secondary metabolites with pharmaceutical properties.

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Song, Guo-qing, Hideo Honda e Ken-ichi Yamaguchi. "Expression of a Rice Chlorophyll a/b Binding Protein Promoter in Sweetpotato". Journal of the American Society for Horticultural Science 132, n. 4 (luglio 2007): 551–56. http://dx.doi.org/10.21273/jashs.132.4.551.

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Leaves are usually the target tissue for expressing transgenes conferring resistances to herbicides, pests, and diseases. To achieve leaf-specific expression, a light-harvest chlorophyll a/b binding protein (CAB) of photosystem-II (CAB2) promoter (CAB2-p) from rice (Oryza sativa L.) and the cauliflower mosaic virus 35S promoter were fused to the β-glucuronidase (GUS) reporter and subsequently evaluated in transgenic sweetpotato [Ipomoea batatas L. (Lam.)]. The 35S promoter-directed GUS activities varied from 46.0 to 61.2 nmol 4-methyl-umbelliferyl-β-D-glucuronide (4-MU) per minute per milligram of protein in leaf, stem, primary, and storage roots. In contrast, the CAB2-p directed an uneven distribution of GUS activities (4-MU at 1.1 to 12.6 nmol·min−1·mg−1 protein); GUS activity in mature leaves was ≈12-fold as high as that in storage roots. In addition, GUS assay in leaf tissues revealed that CAB2-p enabled a developmentally controlled and light-regulated GUS expression. These results indicate that the rice CAB2-p could be used to drive leaf-specific expression of linked genes in sweetpotato.

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Dangler, James M. "Alabama's Foundation Sweetpotato Program Maintains Root Quality". HortTechnology 4, n. 3 (luglio 1994): 224b—227. http://dx.doi.org/10.21273/horttech.4.3.224b.

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Many sweetpotato growers produce their own transplants to control quality, assure timely availability, and reduce production costs. The Alabama Crop Improvement Association, Inc., maintains Foundation, Registered, and Certified stocks to provide sweetpotato producers with high-quality sweetpotatoes. These sweetpotato roots are available to growers in any state to improve the quality of their rootstock. Sweetpotatoes produced in the crop improvement program are examined in the bed and the field. They are inspected by the Alabama Dept. of Agriculture and Industries, stored in approved facilities, graded, and shipped in clean crates that are tagged prior to transport and delivery to producers. As a result of the program, sweetpotatoes are produced free of serious diseases and pests, and exhibit the characteristics of the variety.

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Monawati, Ari, Desi Rhomadhoni e Nur Rokhimah Hanik. "Identifikasi Hama dan Penyakit Pada Tanaman Anggrek Bulan (Phalaenopsis amabilis)". Florea : Jurnal Biologi dan Pembelajarannya 8, n. 1 (20 maggio 2021): 12. http://dx.doi.org/10.25273/florea.v8i1.9002.

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<pre>Orchid is the general name for all types of plants in the family Orchidaceae (family of orchids). This family is one of the largest groups among other flowering plants. It is estimated that worldwide there are around 15,000-20,000 species of orchids with 900 genera (clans) that grow endemic to forests scattered in various countries. Of all orchid species in the world, 5,000 of them are in Indonesia. Broadly speaking, the classification of orchids is divided into 5 subfamilies, 16 tribes (tribes), and 28 subtribes. Phalaenopsis is a genus of orchids which is popular for its diversity and beauty of flowers. The government through presidential decree (Kepres) No. 4 of 1993, on January 9, 1993, designated the moon orchid as a charm flower named Latin Phaleonopsis amabilis, this orchid grows attached to a tree trunk or branch and is one type of orchid endemic to Indonesia. The development of orchid cultivation has never been separated from disease and pest problems. With few disease infections and pest attacks, the beauty will change, of course, the selling price will fall. Orchid plants require extra care to grow with beautiful flowers. Orchid disease can be caused by bacteria, fungi or viruses. Diseases and pests that attack orchid plants can cause death if allowed to continue. Besides that, mishandling can also cause the death of orchids. The purpose of this study was to determine the pests and diseases of the Phalaenopsis amabilis plant.</pre><pre>This research was conducted on December 2, 2020 and January 13-14, 2021 in Carikan Sukoharjo with 10 samples of Phalaenopsis amabilis plants. The tools needed in this research include writing tools, tables, loops and documentation tools (cellphone cameras). The variables to be observed were diseases and pests that attacked. The methods used were direct observation and interviews, the data obtained were analyzed by qualitative descriptive.</pre>Research conducted on 10 samples of Phalaenopsis amablis, found 6 pests and 2 diseases. Pests on the Phalaenopsis amabilis Moon Orchid plant are found that very often attack such as ants, snails, grasshoppers, mealybugs, mites and caterpillars. Whereas in the disease of the Moon Orchid plant (Phalaenopsis amabilis) in the search for Sukoharjo, the fungus Fussarium oxyporum and Rhizoctonia solani attack the leaves, stems, roots of Phalaenopsis amabilis. This disease enters the plant tissue through stomata or wounds in plants. In general, the characteristics of a fungal attack include small spots on the leaves, blisters like being scalded, watery, either cloudy or clear.

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Wszelaczyńska, Elżbieta, Małgorzata Szczepanek, Jarosław Pobereżny e Maciej J. Kazula. "Effect of biostimulant application and long-term storage on the nutritional value of carrot". Horticultura Brasileira 37, n. 4 (ottobre 2019): 451–57. http://dx.doi.org/10.1590/s0102-053620190414.

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ABSTRACT The nutritional value of carrot is determined by the content of total sugars and monosaccharides, carotenoids and vitamins, including vitamin C, in its roots. In 2009-2011, field experiments were carried out concerning the effect of biostimulating preparations applied during the carrot vegetation period on selected nutrients of its roots (total sugars, monosaccharides, carotenoids and vitamin C). Two biostimulants were foliarly applied in doses of 2 or 3 L ha-1 on various dates. Kelpak SL and Asahi SL: one, two or three applications; where, second and third applied at 2-week interval, additionally Kelpak SL: one application at 4-leaf phase, followed by additional application after 4 weeks. The field study was conducted in a randomized block design with four replications. The treatments of plant protection from diseases and pests complied with carrot requirements. The subject of the research was carrot of the Karotan cultivar. The content of selected components in carrot roots was determined directly after harvest and after six months of storage in the storage chamber with controlled temperature and relative air humidity. The foliar application of Kelpak SL in a single dose (2 L ha-1) at 4-leaf development phase resulted in the significant increase of total sugars, reducing sugars, total carotenoids and vitamin C. A six-month storage period resulted in a decrease of total sugars by 5% and ascorbic acid by 16.8% compared to nutritional values measured right after harvest.

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Lubis, Arif Ridho, Santi Prayudani, Muharman Lubis e Al Khowarizmi. "Decision Making in the Tea Leaves Diseases Detection Using Mamdani Fuzzy Inference Method". Indonesian Journal of Electrical Engineering and Computer Science 12, n. 3 (1 dicembre 2018): 1273. http://dx.doi.org/10.11591/ijeecs.v12.i3.pp1273-1281.

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The tea plants (Camellia Sinensis) are small tree species that use leaves and leaf buds to produce tea harvested through a monoculture system. It is an agriculture practice to cultivate one types of crop or livestock, variety or breed on a farm annually. Moreover, the emergence of pests, pathogens and diseases cause serious damages to tea plants significantly to its productivity and quality to optimum worst. All parts of the tea plant such as leaves, stems, roots, flowers and fruits are exposed to these harm lead to loss of yield 7 until 10% per year. The intensity of these attacks vary greatly on particular climate, the degree slope and the plant material used. Therefore, this study analyzes tea leaves as a common part used in recipes to create unique taste and flavor in tea production, especially in agro-industry. The decision making method used is Fuzzy Mamdani Inference as one of model with functional hierarchy with initial input based on established criteria. Fuzzy logic will provide tolerance to the set of value, so that small changes will not result in significant category differences, only affect the membership level on the variable value. Previous method using probabilities have shown 78% tea leaves have been attacked by category C (Gray Blight) while using Mamdani indicated 86% of tea leaves have been infected. In this case, this result pointed out that Fuzzy Mamdani Inferences have more optimal result compare to the previous method.

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Bassal, Hussein, Othmane Merah, Aqeel M. Ali, Akram Hijazi e Fawaz El Omar. "Psophocarpus tetragonolobus: An Underused Species with Multiple Potential Uses". Plants 9, n. 12 (8 dicembre 2020): 1730. http://dx.doi.org/10.3390/plants9121730.

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Natural products, particularly those extracted from plants, have been used as therapy for different diseases for thousands of years. The first written records on the plants used in natural medicine, referred to as “medicinal plants”, go back to about 2600 BC. A thorough and complete understanding of medicinal plants encompasses a multiplex of overlapping and integrated sciences such as botany, pharmacognosy, chemistry, enzymology and genetics. Psophocarpus tetragonolobus, a member of Fabaceae family also called winged bean, is a perennial herbaceous plant characterized by its tuberous roots and its winged pod twinning and a perennial legume rich in proteins, oils, vitamins and carbohydrates. Besides nutrients, winged bean also contains bioactive compounds that have therapeutic activities like anti-oxidant, anti-inflammatory, antinociceptive, antibacterial, antifungal, antiproliferative and cytotoxic activity, a few of which already been reported. This plant can also be used as a medicinal plant for future benefits. With this concept in mind, the present review is designed to shed the light on the interests in the various phytochemicals and pharmacological pharmacognostical aspects of Psophocarpus tetragonolobus.

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Munareto, Janete Denardi, Thomas Newton Martin, Tania Maria Müller, Ubirajara Russi Nunes, Guilherme Bergeijer da Rosa e Luiz Fernando Teleken Grando. "Compatibility of Azospirillum brasilense with fungicide and insecticide and its effects on the physiological quality of wheat seeds". Semina: Ciências Agrárias 39, n. 2 (15 marzo 2018): 855. http://dx.doi.org/10.5433/1679-0359.2018v39n2p855.

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Seed treatment is a practice that helps the initial establishment of the crop without the effects caused by pests and diseases. The association of diazotrophic bacteria with grasses has been used in the supply of nitrogen to plants; however, these microorganisms produce growth-promoting substances, which promote benefits in the growth and development of the crops. Thus, the objective of this study was to evaluate the compatibility of Azospirillum brasilense associated with the fungicide difenoconazole and the insecticide thiamethoxam by observing the effects on the quality of seed emergence of three wheat cultivars (Triticum aestivum L.). Three wheat cultivars, arranged in a 4 x 2 factorial system with four replicates, were tested. The treatments were the control; difenoconazole (Spectro® at a dose of 150 mL per 100 kg of seed); thiamethoxam (Cruiser® FS 350 at a dose of 200 mL per 100 kg seed) and difenoconazole + thiamethoxam, applied on wheat cultivars TBIO Mestre, TBIO Itaipu and TBIO Sinuelo. Bacteria from the Azospirillum genus were used in the inoculation. The wheat seed retains its quality when it checks the germination, vigor and independent accelerated aging, whether or not fungicide, insecticide and A. brasilense were used. The insecticide thiamethoxam increased the length of shoots and roots and provided compatibility with A. brasilense, and fungicide inhibited the length of shoots and roots and was antagonistic to the bacterium A. brasilense.

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Velicof, Mihai. "Conceptual Delimitations in the Field of Biosecurity". International conference KNOWLEDGE-BASED ORGANIZATION 26, n. 1 (1 giugno 2020): 167–71. http://dx.doi.org/10.2478/kbo-2020-0026.

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AbstractBiosecurity is a term who was brought more into our attention after the events of September 11, 2010 who have been followed by the most famous bioterrorist attack with the anthrax letters. Defining biosecurity is not as easy how it looks at first side because this term it has a lot of interpretations according to various disciplines where it is used. At the beginning biosecurity was introduced as a set of measures with the purpose to reduce the risk of transmission of the infectious diseases in living modified organism, quarantined pests and infectious diseases in livestock and crops. Nowadays the term includes also the biological threats to environment, industries and to people and brings into our attention terms like bioterrorism, bioattack, bioweapons, biodefense, biosafety, biohazard, biorisk, biocontainment and biosurety. This article has one primary objective and that is to assess the roots and etymology of the term biosecurity by presenting a short historical perspective which will lead to a better delimitation of the concept, and to define some key concepts related to this area. The result of this conceptual delimitation of the biosecurity is to bring into attention the importance of this area which before COVID-19 events wasn’t took into consideration at the level it should be.

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21

Pool, Joshua R., Jason J. Griffin, Cheryl R. Boyer e Stuart L. Warren. "Establishment and Growth of Transplanted Conifers in the Southern Great Plains". Journal of Environmental Horticulture 30, n. 4 (1 dicembre 2012): 214–18. http://dx.doi.org/10.24266/0738-2898.30.4.214.

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Pinus spp. (pine) currently experience considerable pressure from numerous pests, diseases, and sometimes harsh climate of the Midwest and Great Plains thus jeopardizing the health of current windbreaks and landscapes. Four species of conifers, Abies nordmanniana (Nordmann fir), Cupressus arizonica (Arizona cypress), Picea engelmannii (engelmann spruce), and Thuja × ‘Green Giant’ (‘Green Giant’arborvitae) were spring planted in a sandy loam soil to observe root and shoot growth during the initial 12 months following transplant. Whole plant (roots and shoots) harvests occurred monthly for examination and collection of growth data. Results indicate that C. arizonica exhibited rapid root and shoot growth throughout the growing season with increases in dry weight of 4800 and 6300%, respectively. In contrast, P. engelmannii exhibited a modest increase in root dry weight of 82% throughout the growing season while shoot growth was essentially non-existent. Thuja × ‘Green Giant’exhibited significant increases in shoot (230%) and root (350%) growth throughout the growing season. Abies nordmanniana exhibited minimal yet significant shoot and root growth during the study, with dry weight increases of 13 and 55%, respectively. The data herein suggests that C. arizonica easily establishes following transplant because it rapidly initiates new root and shoot growth.

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22

Pool, Joshua R., Jason J. Griffin, Cheryl R. Boyer e Stuart L. Warren. "Short-term Recurring Drought Affects Growth and Photosynthetic Capacity of Four Conifer Species". Journal of Environmental Horticulture 31, n. 1 (1 marzo 2013): 39–42. http://dx.doi.org/10.24266/0738-2898.31.1.39.

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Abstract (sommario):

The Midwest and southern Great Plains are known for historic and severe droughts. More common, however, are short-term recurring drought events that can limit tree survival. The pressure of environmental stress combined with numerous diseases and pests are decimating existing Pinus L. spp. (pine) plantings and driving the effort to identify alternative species. Four species of conifer were subjected to recurring moderate or severe drought to observe the effects on growth and photosynthesis. Species evaluated were: Abies nordmanniana (Nordmann fir), Cupressus arizonica (Arizona cypress), Picea engelmannii (Engelmann spruce), and Thuja × ‘Green Giant’ (‘Green Giant’ arborvitae). Recurring drought reduced height and growth index of T. × ‘Green Giant’. However, photosynthesis and root growth were unaffected by drought treatments. In contrast, reduced Pnet was the only detectable effect of recurring drought in P. engelmannii. Growth of A. nordmanniana was not affected by drought. When subjected to drought, C. arizonica reduced shoot dry weight, while maintaining photosynthesis and root growth. Overall, C. arizonica was able to maintain growth of roots and shoots as well as maintain photosynthesis which may be an advantage in the harsh climate of the Midwest and southern Great Plains.

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Harman, Gary E., e Norman Uphoff. "Symbiotic Root-Endophytic Soil Microbes Improve Crop Productivity and Provide Environmental Benefits". Scientifica 2019 (2 aprile 2019): 1–25. http://dx.doi.org/10.1155/2019/9106395.

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Plants should not be regarded as entities unto themselves, but as the visible part of plant-microbe complexes which are best understood as “holobiomes.” Some microorganisms when given the opportunity to inhabit plant roots become root symbionts. Such root colonization by symbiotic microbes can raise crop yields by promoting the growth of both shoots and roots, by enhancing uptake, fixation, and/or more efficient use of nutrients, by improving plants’ resistance to pests, diseases, and abiotic stresses that include drought, salt, and other environmental conditions, and by enhancing plants’ capacity for photosynthesis. We refer plant-microbe associations with these capabilities that have been purposefully established as enhanced plant holobiomes (EPHs). Here, we consider four groups of phylogenetically distinct and distant symbiotic endophytes: (1) Rhizobiaceae bacteria; (2) plant-obligate arbuscular mycorrhizal fungi (AMF); (3) selected endophytic strains of fungi in the genusTrichoderma; and (4) fungi in the Sebicales order, specificallyPiriformospora indica. Although these exhibit quite different “lifestyles” when inhabiting plants, all induce beneficial systemic changes in plants’ gene expression that are surprisingly similar. For example, all induce gene expression that produces proteins which detoxify reactive oxygen species (ROS). ROS are increased by environmental stresses on plants or by overexcitation of photosynthetic pigments. Gene overexpression results in a cellular environment where ROS levels are controlled and made more compatible with plants’ metabolic processes. EPHs also frequently exhibit increased rates of photosynthesis that contribute to greater plant growth and other capabilities. Soil organic matter (SOM) is augmented when plant root growth is increased and roots remain in the soil. The combination of enhanced photosynthesis, increasing sequestration of CO2from the air, and elevation of SOM removes C from the atmosphere and stores it in the soil. Reductions in global greenhouse gas levels can be accelerated by incentives for carbon farming and carbon cap-and-trade programs that reward such climate-friendly agriculture. The development and spread of EPHs as part of such initiatives has potential both to enhance farm productivity and incomes and to decelerate global warming.

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Tordable, M. del C., A. J. Andrade, M. E. Doucet e P. Lax. "Histopathology of Andean Potato (Solanum tuberosum Andigenum group) varieties parasitized by the false root-knot nematode, Nacobbus aberrans". Brazilian Journal of Biology 78, n. 4 (1 febbraio 2018): 679–85. http://dx.doi.org/10.1590/1519-6984.172401.

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Abstract Landraces of the Solanum tuberosum Andigenum group are abundant and diverse. They are a valuable genetic resource possessing resistance to pests, diseases, and environmental stresses. In the Andean region, populations of the false root-knot nematode Nacobbus aberrans became specialized to infect native potatoes, being one of the major limiting factors affecting this crop. A better understanding of the host plant-parasite interactions is important in order to select tolerant or resistant plants to be included in management programs. Despite the close of association of N. aberrans with potato, and the great diversity of the S. tuberosum Andigenum group, few histopathological studies have been conducted. The aim of this work was to analyze histological alterations induced by different Argentine populations of the nematode in naturally infested roots of four Andean potato varieties (Collareja, Negra Imilla, Ojo de Señorita and Colorada). All the varieties showed hyperplastic tissue in the central zone of galls, where syncytia developed in close association with the nematode female. Syncytia were composed of modified hyperplastic tissue and parenchyma xylem cells. The results showed differences among varieties in their response to nematode populations, with Ojo de Señorita and Negra Imilla being the most susceptible ones. This study is the first describing histopathological alterations induced by N. aberrans in susceptible Andean potato landraces.

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Fraedrich, Stephen W., e L. David Dwinell. "An Evaluation of Dazomet Incorporation Methods on Soilborne Organisms and Pine Seedling Production in Southern Nurseries". Southern Journal of Applied Forestry 27, n. 1 (1 febbraio 2003): 41–51. http://dx.doi.org/10.1093/sjaf/27.1.41.

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Abstract The use of dazomet as a fall and spring fumigant for pine seedling production and control of soilborne pests was evaluated at two southern nurseries. Dazomet was applied at low (280–325 kg/ha) and high (493–560 kg/ha) rates and incorporated with a rototiller or spading machine. Comparisons were made with methyl bromide/chloropicrin (MBC) fumigation and nonfumigated control treatments. Dazomet incorporation method had no effect on seedling density at either nursery, and often did not affect seedling morphological characteristics. At the Georgia (GA) nursery, seedling density and morphological characteristics did not differ among fumigant treatments except in the spring study area where shoot weight was greater in the MBC treatment than the dazomet or nonfumigated control treatments. In the fall study area at the North Carolina (NC) nursery, seedling density was greater in the high-rate dazomet treatment than the nonfumigated control. Seedlings were generally larger in MBC and dazomet treatments than the control. Seedling density and morphological characteristics did not differ among fumigation treatments in the spring study area. Fumigation with MBC or dazomet generally reduced the percentage of roots withPythium andFusarium spp. compared to controls at the GA nursery and the fall fumigation area in the NC nursery. Plant parasitic nematodes were found infrequently at both nurseries and did not differ among treatments. Nutsedge (Cyperus spp.) was the major problem at the GA nursery and was effectively controlled only with MBC. Compared to the MBC treatment, the abundance of soilborne fungi and the association of certain types ofTrichoderma with roots was often lower in the dazomet treatments. The importance of these differences for long term seedling production and management of soilborne diseases is not known at this time. South. J. Appl. For. 27(1):41–51.

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Smiley, Richard W., Abdelfattah A. Dababat, Sadia Iqbal, Michael G. K. Jones, Zahra Tanha Maafi, Deliang Peng, Sergei A. Subbotin e Lieven Waeyenberge. "Cereal Cyst Nematodes: A Complex and Destructive Group of Heterodera Species". Plant Disease 101, n. 10 (ottobre 2017): 1692–720. http://dx.doi.org/10.1094/pdis-03-17-0355-fe.

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Abstract (sommario):

Small grain cereals have served as the basis for staple foods, beverages, and animal feed for thousands of years. Wheat, barley, oats, rye, triticale, rice, and others are rich in calories, proteins, carbohydrates, vitamins, and minerals. These cereals supply 20% of the calories consumed by people worldwide and are therefore a primary source of energy for humans and play a vital role in global food and nutrition security. Global production of small grains increased linearly from 1960 to 2005, and then began to decline. Further decline in production is projected to continue through 2050 while global demand for these grains is projected to increase by 1% per annum. Currently, wheat, barley, and oat production exceeds consumption in developed countries, while in developing countries the consumption rate is higher than production. An increasing demand for meat and livestock products is likely to compound the demand for cereals in developing countries. Current production levels and trends will not be sufficient to fulfill the projected global demand generated by increased populations. For wheat, global production will need to be increased by 60% to fulfill the estimated demand in 2050. Until recently, global wheat production increased mostly in response to development of improved cultivars and farming practices and technologies. Production is now limited by biotic and abiotic constraints, including diseases, nematodes, insect pests, weeds, and climate. Among these constraints, plant-parasitic nematodes alone are estimated to reduce production of all world crops by 10%. Cereal cyst nematodes (CCNs) are among the most important nematode pests that limit production of small grain cereals. Heavily invaded young plants are stunted and their lower leaves are often chlorotic, forming pale green patches in the field. Mature plants are also stunted, have a reduced number of tillers, and the roots are shallow and have a “bushy-knotted” appearance. CCNs comprise a number of closely-related species and are found in most regions where cereals are produced.

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Goud, Jan-Kees C., Aad J. Termorshuizen, Wim J. Blok e Ariena H. C. van Bruggen. "Long-Term Effect of Biological Soil Disinfestation on Verticillium Wilt". Plant Disease 88, n. 7 (luglio 2004): 688–94. http://dx.doi.org/10.1094/pdis.2004.88.7.688.

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Abstract (sommario):

Biological soil disinfestation (BSD), involving incorporation of grass combined with plastic mulching, eliminates many soilborne pests and diseases through the creation of anaerobic conditions. BSD was compared at two locations with a nontreated control, Italian ryegrass amendment alone, and plastic mulch alone. After the soil treatments, plots were cropped with Acer platanoides and Catalpa bignonioides and grown for 4 years. Relative to the control, soil inoculum levels of Verticillium dahliae were reduced by 85% after BSD and did not increase for 4 years. Populations of Pratylenchus fallax, known for their interaction with V. dahliae, in the soil and in roots were reduced by 95 to 99%. The incidence of infection by V. dahliae was reduced by 80 to 90%. Verticillium wilt severity was significantly reduced in A. platanoides in all 4 years at one location and in the first 2 years at the other location, and significantly fewer plants died at one location. Shoot length and trunk width were larger after BSD compared with the control at one location. Market value of the crop in BSD plots was up to € 140,000 ha-1 higher for A. platanoides and up to € 190,000 ha-1 higher for C. bignonioides than in the untreated control. BSD is an effective, economically profitable, and environmentally friendly control method for tree nurseries.

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Wuyts, Nathalie, Rony Swennen e Dirk De Waele. "Effects of plant phenylpropanoid pathway products and selected terpenoids and alkaloids on the behaviour of the plant-parasitic nematodes Radopholus similis, Pratylenchus penetrans and Meloidogyne incognita". Nematology 8, n. 1 (2006): 89–101. http://dx.doi.org/10.1163/156854106776179953.

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Abstract (sommario):

AbstractPlants produce a wide range of biologically active chemicals which have been extensively explored for nematode-antagonistic properties. Although phenylpropanoids are part of the chemical defence system of plants against pests and diseases, including parasitic nematodes, no comprehensive study exists which relates (levels of) phenylpropanoid compounds in roots to actual effects on nematode behaviour. Therefore, a broad spectrum evaluation was made of the effects of phenylpropanoids (simple phenolics and flavonoids) and selected monoterpenoids and alkaloids on the behaviour of the migratory endoparasites Radopholus similis and Pratylenchus penetrans and the sedentary endoparasite Meloidogyne incognita. In vitro bioassays assessed effects on chemotaxis, motility, viability and hatch. Compared with the other two nematode species, P. penetrans was remarkably insensitive to the test compounds. Only phloretin was (limited) hatch inhibitive. This property was shared by other chalcone-related compounds for R. similis. Repellents and motility inhibitors for R. similis and M. incognita were found among the simple phenolic compounds. Flavonols stood out as repellent compounds for both these nematode species, while they were, in their degraded form, also motility inhibitors for M. incognita. Dopamine was an attractant for R. similis, while ferulic acid was strongly motility inhibitive and toxic (LC50 of 120 μg ml−1) for this nematode species. Salicylic acid was a strong attractant for M. incognita. The compound was also nematicidal (LC50 of 46 μg ml−1) and an irreversible inhibitor of hatch.

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Chikowe, Ibrahim, Moira Mnyenyembe, Stuart Jere, Andrew G. Mtewa, John Mponda e Fanuel Lampiao. "An Ethnomedicinal Survey of Indigenous Knowledge on Medicinal Plants in the Traditional Authority Chikowi in Zomba, Malawi". Current Traditional Medicine 6, n. 3 (9 marzo 2020): 225–41. http://dx.doi.org/10.2174/2215083805666190821104434.

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Abstract (sommario):

Introduction: Medicinal plants and ethnomedicinal studies continue playing a significant role in herbal products development and traditional knowledge conservation. Calls for ethnomedicinal studies have increased recently to unleash the potential in medicinal plants and document verbal traditional knowledge. This study recorded the medicinal plants administered by traditional practitioners in the Traditional Authority Chikowi area of Zomba district in Malawi. Methodology: This cross-sectional study was conducted for 2 weeks in September 2017. Semi-structured questionnaires were administered to traditional medicine practitioners using snowball sampling in the company of botany personnel from the National Herbarium and Botanical Gardens (NHBG). Data collected included plant local names, medicinal uses, parts used, preparation methods and administration methods to clients. Some species were photographed and identified in the field by the NHBG officers. Results: Five traditional practitioners were interviewed. Fifty-nine medicinal plant species belonging to 38 families were used as prophylaxis and treatment for 27 communicable and non-communicable diseases/conditions. Fabaceae family (papilionoideae 11.9%, mimosoideae 5.1%, caesalpinioideae 1.7%) had the largest percentage of species (18.6%). Preparation methods ranged from infusion (38.0%) to cream (2.0%). Of these, 86.0%, 12.0% and 2.0% were administered orally, topically and rectally respectively. Roots were the most used part (60.8%) while the least used was flowers (1.3%). Nearly two-thirds were trees or shrubs (32.2% each). Conclusion: The area has a rich biodiversity of medicinal plant species and knowledge scientists can use as a baseline for identification of plant species, bioactive compounds and preparations with useful medicinal properties.

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Hlevaskiy, V., V. Rybak, V. Kuyanov e R. Shapovalenko. "Sugar beets root crops productivity in different hybrids". Agrobìologìâ, n. 2(153) (18 dicembre 2019): 6–12. http://dx.doi.org/10.33245/2310-9270-2019-153-2-6-12.

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Abstract (sommario):

Modern sugar beet hybrids have a potential root crop capacity of above 50.0 t/ha and sugar content of 16.1–18.5 %. Seeds with a germination rate of not less than 90 % are being used in this case, highly efficient energy-saving technologies based on the use of agricultural techniques (crop rotation, fertilization system, soil tillage system, sowing at the final density), protection against pests and diseases, the method of harvesting root crops are used. The performance of the sugar beet hybrid is mainly determined by the genetic information contained in the seeds and the conditions in which the plants grow. The purpose of the research was to investigate the varietal features of growth, development and productivity of sugar beet in the conditions of the central part of the Right-bank forest-steppe of Ukraine. The following sugar beet hybrids were used for sowing: Olzhych, Etude, Zluka, Constanta and Anichka with the fraction of 3.5–4.5 mm and laboratory germination of 85–90 %. The growth and development of sugar beet plants of different hybrids differed. There was a tendency for more positive germination of seeds and a more complete density of seedlings in the hybrid Constanta. The productivity of the sugar beet root crops is determined by the yield, sugar content and sugar harvest. Crop capacity of the male sterile hybrids studied averaged from 46.4 to 55.6 t/ha over the three years of studies, sugar content – 15.6–17.0 % and sugar yield – 7.4–9.5 t/ha. Hybrids Zluka and Constanta appeared to be the most adapted to the conditions of the central part of the right-bank forest-steppe of Ukraine. Thus, over three years, the Zluka hybrid had an average crop capacity of 55.6 t/ha, the sugar content of the roots was 16.1 %, the sugar harvest was 9.0 t/ha, and the hybrid Constant had a yield of 55.1 t/ha, the sugar content of the roots – 16.2 %, sugar yield – 8.1 t/ha. Key words: sugar beets, hybrids, field germination of seeds, sugar content, sugar yield.

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Hodel, Donald R. "Biology of Palms and Implications for Management in the Landscape". HortTechnology 19, n. 4 (gennaio 2009): 676–81. http://dx.doi.org/10.21273/hortsci.19.4.676.

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Comprising a natural and distinctive group, palms (Arecaceae) differ from other woody plants in their structure and growth features that require or offer unique and sometimes advantageous landscape management opportunities. Although palms are a mostly tropical group that lacks dormancy and cold tolerance, there are numerous species possessing sufficient cool or cold hardiness to be suitable for landscaping in subtropical and even some temperate areas. The habit of palms is largely dependent on the number of stems and the length to which they elongate. There are solitary or multistemmed palms and tree or shrub palms. Regardless of habit, there is typically only one growing point or apical meristem per palm stem. Thus, multistemmed palms may be especially versatile landscape subjects because in many instances, one is able to control height and density by judicious removal of stems. The uniquely constructed palm stem, with growth restricted to its extremities (leaves and inflorescences distally, roots proximally, and wholly the product of primary growth), is composed largely of numerous, dispersed, hard, fibrous-sheathed, vascular bundles embedded in a matrix of water- and carbohydrate-storing parenchyma cells. Often likened to a steel-reinforced concrete column and offering tremendous strength and resiliency, palm stems lack a peripheral vascular cambium and, thus, capability for secondary growth, meaning they do not thicken much once they elongate vertically and there is no ability to repair damaged tissue. Thus, care should be taken when performing horticultural tasks to avoid making wounds (which are permanent, unsightly, and potential entry sites for pests and diseases) and damaging the sole apical meristem. A palm's total photosynthetic and reproductive efforts are concentrated into relatively few but large organs (leaves and inflorescences respectively), offering a unique opportunity to capture an entire year's worth of potential leaf, flower, and fruit litter before it falls into the landscape. The palm root system is adventitious and composed of numerous, small- to medium-sized, nonwoody roots. All primary roots are of a more or less constant diameter and arise independently from an area at or near the base of the stem called the root initiation zone. Because of these root system characteristics and the ability of their trunks to store water and carbohydrates, palms are relatively easy to transplant—even large specimens with small root balls—resulting in instant, mature landscapes.

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Zukalová, H., J. Vašák, D. Nerad e P. Štranc. "The role of glucosinolates of Brassica genus in the crop system". Plant, Soil and Environment 48, No. 4 (11 dicembre 2011): 181–89. http://dx.doi.org/10.17221/4218-pse.

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Abstract (sommario):

Glucosinolates with Brassica genus as secondary metabolites have a lot of functions and effects. Glucosinolates form less than 2% of the overall sulphur content at the beginning of vegetation in different parts of the plants and during growth their content is decreasing and forms less than 0.1%. This low representation doubts their storage function. With its chemical composition, they are ranked among natural pesticides with active and passive resistance against diseases and pests. They show repellent effects and properties of natural biofumigators in soil after ploughing in their biomass as green fertilizing, or after ploughing in after harvest the leftovers of rape. The principle of these effects is decomposition products of glucosinolates – bioactive isothiocyanates. Very important from this point of view are turnip rape Rex and Brassica juncea, whose content of these compounds is the highest one and they are resistant against the attack of Ceutorrhynchus pleurostigma. The same effect showed also when attacked by Phoma lingam. With other winter Brassicas either hybrid or linea and summer rape is this defensive system suppressed because of their lowered content due to breeding interferences, leading to limitation of their anti-nutritional negative effects. It is possible to state the final result after finding out the production of the above matter, roots, and after evaluation of the sorbal characteristics of the soil and evaluation of the state of health of the following crop or vegetable. After this overall analysis, it will be possible to evaluate the biofumigation properties of accessible varieties of the Brassica genus.

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Prasetyo, Riko, Iwan Sasli e Dan Tris Haris Ramadhan. "Keragaman Vegetasi dan Identifikasi Fungi Mikoriza Arbuskula (FMA) Pada Lahan Bekas Tambang". Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 47, n. 2 (30 agosto 2019): 217–23. http://dx.doi.org/10.24831/jai.v47i2.25050.

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Abstract (sommario):

Revegetation of former gold mining land is expected to restore soil fertility. One of the ways to use the gold-mined land as agricultural land is by utilizing the symbioses of arbuscular mycorrhizal fungi (AMF) is expected to accelerate the revegetation process. The aim of the study was to analyze vegetation and AMF exploration in secondary forest land (SF) and former gold mining land (FGML) in the Mandor District . The research stages were conducting the plant identification and the exploration of AMF at the laboratory of Pests and Diseases of Faculty of Agriculture, University of Tanjungpura. The research was conducted for ± 2 months starting from February to April 2018. The parameter of the observation was done by finding the summed dominance ratio (SDR) value, diversity index (DI), the density of spore (DS), relative frequency (RF), the identification of spore, and the analysis of plant root infection. The research finding showed that from the calculation of SDR, there were two dominant plants i.e. Paspalum conjugatum and Melastoma candidum. The calculation result of DI was categorized as ‘moderate’ in three locations of observation. The observation of DS in SF obtained the highest value of 750 spores/100 grams of soil. The total genus Glomus in SF and FGML > 10 years had a higher value than genus Acaulospora. In the three locations of observation, it had been obtained the genus Glomus and Acaulospora, while there was an infection at the observation of staining roots; it was characterized by the existence of arbuscular, vesicles, and external hyphae.

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Silva, João Vasco, e Ken E. Giller. "Grand challenges for the 21st century: what crop models can and can't (yet) do". Journal of Agricultural Science 158, n. 10 (dicembre 2020): 794–805. http://dx.doi.org/10.1017/s0021859621000150.

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AbstractCrop production is at the core of a ‘perfect storm’ encompassing the grand challenges of achieving food and nutrition security for all, in the face of climate change, while avoiding further conversion of natural habitats for agriculture and loss of biodiversity. Here, we explore current trends in crop modelling related to these grand challenges by reflecting on research presented at the Second International Crop Modelling Symposium (iCropM2020). A keyword search in the book of abstracts of the symposium revealed a strong focus on ‘climate change’, ‘adaptation’ and ‘impact assessment’ and much less on ‘food security’ or ‘policy’. Most research focused on field-level investigations and far fewer on farm(ing) systems levels – the levels at which management decisions are made by farmers. Experimentation is key to development and testing of crop models, yet the term ‘simulation’ outweighed by far the terms ‘experiments’ and ‘trials’, and few contributions dealt with model improvement. Cereals are intensively researched, whereas roots, tubers and tropical perennials are under-researched. Little attention is paid to nutrient limitations apart from nitrogen or to pests and diseases. The aforementioned aspects represent opportunities for future research where crop models can help in devising hypotheses and driving new experimentation. We must also ensure that crop models are fit for their intended purposes, especially if they are to provide advice to policymakers. The latter, together with cross-scale and interdisciplinary efforts with direct engagement of stakeholders are needed to address the grand challenges faced by food and agricultural systems in the next century.

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Rotasouw, Shiska M., Johanna Taribuka e Handry R. D. Amanupunyo. "Identifikasi dan Kemampuan Jamur Endofitik Asal Jagung (Zea mays L.) Terhadap Patogen Busuk Pelepah (Rhyzoctonia solani)". JURNAL BUDIDAYA PERTANIAN 16, n. 2 (30 dicembre 2020): 140–46. http://dx.doi.org/10.30598/jbdp.2020.16.2.140.

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Maize is a cereal crop which is an important source of food because it is the second source of carbohydrates after rice. Maize cultivation is faced with various plant diseases, that can reduce the quantity and quality of crop yield. Plant disease is one of the limiting factors for crop production and seed quality. One of the most harmful maize diseases is blight or midrib rot caused by the soil-borne fungus Rhizoctonia solani. The aim of the study was to obtain endophytic microorganisms in maize and to test the antagonistic ability of these fungi as biological control agents against R. solani. The study took place in January-September 2018 in the field and the Laboratory of Plant Pests and Diseases, Faculty of Agriculture, University of Pattimura. Endophytic fungi isolated from maize plants from the roots, stems and leaves. Samples were cleaned in running water and air-dried. Subsequently, the samples were sterilized using 70% alcohol and immersed in sodium hypochlorite solution for 2 minutes and rinsed with sterile water 3 times. The sterilized roots, stems and leaves of maize were peeled, cut to a size of ±5 mm, split and dried on sterile filter paper. Sterile samples were grown on PDA culture media at four points and incubated at room temperature. Visual identification was carried out with the aid of a microscope on fungi growing on the culture media. The results showed the presence of the endophytic fungi Trichoderma sp., Aspergillus sp., Penicillium sp., Diplodia sp. and Mucor sp. These fungal species showed different inhibitory powers, which included mechanisms for direct parasitizing of pathogens, producing antibiotics and competition for space and nutrients. Keywords: antagonism, corn, endophytic fungi, identification, pathogenic fungus, Rhizoctonia solani ABSTRAK Jagung (Zea mays L.) merupakan tanaman serelia yang termasuk bahan pangan penting karena merupakan sumber karbohidrat kedua setelah beras. Salah satu kendala dalam budidaya tanama jagung adalah penurunan produksi akibat serangan patogen penyebab penyakit. Untuk menekan perkembangan penyakit dilakukan pengendalian dengan menggunakan mikroorganisme endofitik asal akar, batang dan daun jagung sebagai agensia pengendalian hayati. Penelitian ini bertujuan mengisolasi dan mengidentifikasi mikroorganisme endofitik asal jagung secara morfologi, mendapatkan mikroorganisme endofitik yang memiliki kemampuan antagonis terhadap jamur Rhizoctonia solani penyebab penyakit busuk pelepah pada jagung. Penelitian berlangsung dalam 2 tahap, yaitu di lapangan dan di Laboratorium Hama dan Penyakit Tumbuhan Fakultas Pertanian, Universitas Pattimura. Sampel tanaman diperoleh dari beberapa kebun petani di wilayah Kota Ambon. Hasil penelitian yang diperoleh adalah bahwa jamur endofitik Trichoderma sp, Aspergillus sp, Penicillium sp, Diplodia sp dan Mucor sp. memiliki daya penghambatan yang berbeda-beda, yaitu 78.57% (Trichoderma sp), 65.86% (Penicillium sp), 43.29% (Aspergillus sp), 36.71 (Diplodia sp) dan 34.44% (Mucor sp). Kata kunci: antagonisme, identifikasi, jagung, jamur endofitik, jamurpatogenik, Rhizoctonia solani

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Ren, Zhongbo, e Jiang Lu. "113 Preliminary Study on Grafting between Vitis rotundifolia and V. vinifera Grapes". HortScience 34, n. 3 (giugno 1999): 461A—461. http://dx.doi.org/10.21273/hortsci.34.3.461a.

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Non-native grape species such as V. vinifera and V. labrusca can not sustain the hot and humid environment of Florida due to their susceptibility to various diseases. Vitis rotundifolia (muscadine grapes) is native to Florida and the southeastern United States and adapted well to this climate condition. They are highly resistant to almost all grape foliage diseases and root pests such as nematode and phylloxera. Theoretically, muscadine grapes may become a valuable rootstock for bunch grapes. Unfortunately, most previous studies found that muscadine grapes were graft-incompatible with bunch grapes by normal grafting techniques. This study was to look for an alternative technique to graft V. vinifera onto muscadine rootstocks. A preliminary study indicated that bunch grape scions were successfully grafted on adult muscadine grapes. Two V. vinifera grape cultivars, `Thompson Seedless' and `Chardonnay', and two muscadine grape cultivars, `Carlos' and `Alachua', were used for this study. The muscadine grapes used as rootstocks are 6-year old field-grown vines and V. vinifera was used as scions. Using the common V-type grafting method was completely failed in more than 150 attempts. We then tried to insert the first-year buds of V. vinifera into 1- to 3-year-old muscadine canes. Surprisingly, the survival rate of the inserting buds was moderately high when `Carlos' was used as the rootstock. `Thompson Seedless'/`Carlos', `Chardonnay'/`Carlos' reached 53% and 33%, respectively. Successful grafting but lower survival rate was also obtained when `Alachua' was used as the rootstock (10% in `Thompson Seedless/`Alachua' and 3% in `Chardonny'/`Alachua'). The average survival rate of `Thompson Seedless' on the muscadine rootstocks was 36%, and `Chardonnay' was 12%. Regardless the cultivar of the scions, buds survived on `Carlos' and `Alachua' rootstocks were 44% and 5%, respectively. Results from this study indicated that V. vinifera grapes could be successfully grafted onto muscadine rootstocks. The survival rate varied depending on cultivars used for both scion and rootstock. It would be very interesting to see if resistance to certain diseases such as the Pierce's disease can be improved in those V. vinifera grape with muscadine roots and trunks derived from this preliminary study.

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Marquez, Nathalie, María L. Giachero, Adrien Gallou, Humberto J. Debat, Sylvie Cranenbrouck, Julio A. Di Rienzo, María J. Pozo, Daniel A. Ducasse e Stéphane Declerck. "Transcriptional Changes in Mycorrhizal and Nonmycorrhizal Soybean Plants upon Infection with the Fungal Pathogen Macrophomina phaseolina". Molecular Plant-Microbe Interactions® 31, n. 8 (agosto 2018): 842–55. http://dx.doi.org/10.1094/mpmi-11-17-0282-r.

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Macrophomina phaseolina is a soil-borne fungal pathogen with a wide host range that causes charcoal rot in soybean [Glycine max (L.) Merr.]. Control of the disease is a challenge, due to the absence of genetic resistance and effective chemical control. Alternative or complementary measures are needed, such as the use of biological control agents, in an integrated approach. Several studies have demonstrated the role of arbuscular mycorrhizal fungi (AMF) in enhancing plant resistance or tolerance to biotic stresses, decreasing the symptoms and pressure caused by various pests and diseases, including M. phaseolina in soybean. However, the specific contribution of AMF in the regulation of the plant response to M. phaseolina remains unclear. Therefore, the objective of the present study was to investigate, under strict in-vitro culture conditions, the global transcriptional changes in roots of premycorrhized soybean plantlets challenged by M. phaseolina (+AMF+Mp) as compared with nonmycorrhizal soybean plantlets (−AMF+Mp). MapMan software was used to distinguish transcriptional changes, with special emphasis on those related to plant defense responses. Soybean genes identified as strongly upregulated during infection by the pathogen included pathogenesis-related proteins, disease-resistance proteins, transcription factors, and secondary metabolism–related genes, as well as those encoding for signaling hormones. Remarkably, the +AMF+Mp treatment displayed a lower number of upregulated genes as compared with the −AMF+Mp treatment. AMF seemed to counteract or balance costs upon M. phaseolina infection, which could be associated to a negative impact on biomass and seed production. These detailed insights in soybean-AMF interaction help us to understand the complex underlying mechanisms involved in AMF-mediated biocontrol and support the importance of preserving and stimulating the existing plant-AMF associates, via adequate agricultural practices, to optimize their agro-ecological potential.

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Jędryczka, Małgorzata, Idalia Kasprzyk, Marek Korbas, Ewa Jajor e Joanna Kaczmarek. "Infestation of Polish Agricultural Soils by Plasmodiophora Brassicae Along The Polish-Ukrainian Border". Journal of Plant Protection Research 54, n. 3 (1 luglio 2014): 238–41. http://dx.doi.org/10.2478/jppr-2014-0036.

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Abstract There has been a rapid, worldwide increase in oilseed rape production that has resulted in enormous intensification of oilseed rape cultivation, leading to tight rotations. This in turn, has caused an accumulation of pests as well as foliar and soil-borne diseases. Recently, clubroot has become one of the biggest concerns of oilseed rape growers. Clubroot is caused by the soil-borne protist Plasmodiophora brassicae Woronin. The pathogen may be present in groundwater, lakes, and irrigation water used in sprinkling systems. It can be easily transmitted from one field to another not only by water, but also by soil particles and dust transmitted by wind and on machinery. The aim of our overall study was to check for P. brassicae infestation of Polish agricultural soils. This paper presents the 2012 results of a study performed along the Polish-Ukrainian border in two provinces: Lublin (Lubelskie Voivodeship) and the Carpathian Foothills (Podkarpackie Voivodeship), in south-east Poland. Monitoring was done in 11 counties, including nine rural and two municipal ones. In total, 40 samples were collected, out of which 36 were collected from fields located in rural areas and four from municipal areas, with two per municipal region. Each sample was collected at 8-10 sites per field, using a soil auger. The biotest to detect the presence of P. brassicae was done under greenhouse conditions using seedlings of the susceptible Brassicas: B. rapa ssp. pekinensis and the Polish variety of oilseed rape B. napus cv. Monolit. Susceptible plants grown in heavily infested soils produced galls on their roots. A county was regarded as free from the pathogen, if none of the bait plants became infected. The pathogen was found in three out of 40 fields monitored (7.5%) in the Carpathian Foothill region. The fields were located in two rural counties. The pathogen was not found in Lublin province, and was also not detected in any of the municipal counties. The detection with a biotest was fully confirmed by PCR-based molecular detection of P. brassicae DNA in soil samples.

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SESWITA, DELIAH. "PENGGUNAAN AIR KELAPA SEBAGAI ZAT PENGATUR TUMBUH PADA MULTIPLIKASI TUNAS TEMULAWAK (Curcuma xanthorrhiza Roxb.) IN VITRO". Jurnal Penelitian Tanaman Industri 16, n. 4 (19 giugno 2020): 135. http://dx.doi.org/10.21082/jlittri.v16n4.2010.135-140.

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ABSTRAKTanaman temulawak (Curcuma xanthorrhiza Roxb.) merupakansalah satu tanaman obat potensial unggulan yang memiliki khasiatmultifungsi. Rimpangnya yang berkhasiat obat mampu mengobati ber-bagai penyakit seperti kelainan pada hati/lever, kantong empedu, danpankreas. Adanya kecenderungan masyarakat ingin menggunakan pengo-batan dengan bahan alami, menjadikan permintaan benih temulawaksebagai bahan baku obat maupun industri jamu di Indonesia meningkatdengan pesat. Kondisi ini memberi peluang kepada petani sebagaipenyedia bahan tanaman. Upaya penyediaan bahan tanaman secara massaldalam waktu singkat serta bebas hama dan penyakit dapat dilakukanmelalui teknik kultur jaringan. Teknik ini dibatasi oleh tingginya biayaperbanyakan, di antaranya penggunaan bahan kimia. Oleh karena itu perludikaji penggunaan zat pengatur tumbuh (ZPT) yang berasal dari bahanalami (salah satunya adalah air kelapa) sebagai substitusi ZPT sintetik.Penelitian penggunaan air kelapa sebagai ZPT dilakukan di LaboratoriumKultur Jaringan Plasma Nutfah Pemuliaan dan Perbenihan, BalaiPenelitian Tanaman Obat dan Aromatik Bogor, dari bulan Mei sampaidengan bulan Desember 2009. Eksplan berasal dari tunas temulawak sterilhasil perbanyakan sebelumnya. Media yang digunakan adalah mediaMurashige and Skoog (MS) yang dikombinasikan dengan beberapa tarafkonsentrasi air kelapa (0, 5, 10, 15, dan 20%) sebagai substitusi ZPT danair kelapa dengan memakai millipore. Media dibuat padat, sebagaipembanding pada media MS + ZPT kimia yaitu BA1,5 mg/l. Percobaanmenggunakan rancangan acak lengkap dengan 10 ulangan. Parameteryang diuji adalah jumlah tunas, jumlah daun dan jumlah akar. Hasilpenelitian menunjukkan, tanpa komponen kimia, dengan penambah airkelapa pada berbagai konsentrasi pada media dasar MS, berhasilmembentuk tunas, daun dan akar. Jumlah tunas terbanyak didapat padakombinasi media dengan penambahan air kelapa 15% sebanyak 3,4 tunas,jumlah daun 2,2 daun serta jumlah akar terbanyak yaitu sebanyak 13,2akar pada umur 2 minggu. Pada kombinasi media dengan memakaimillipore, tunas terbanyak hanya 2,6 tunas, tetapi tidak berbeda nyatadengan perlakuan kontrol MS + BA 1,5 mg/l, yaitu sama-sama memiliki2,6 tunas, 3,6 daun, dan 15,4 akar.Kata kunci : Curcuma xanthorrhiza Roxb., in vitro, air kelapa, zatpengatur tumbuh, multiplikasi in vitroABSTRACTThe use of Coconut Water as Growth Regulator onMultiplication of Java Turmeric Buds (Curcumaxanthorrhiza Roxb. ) in vitroJava turmeric (Curcuma xanthorrhiza Roxb.) is a potentialmedicinal plant which has many uses. Its rhizome has efficacy to curevarious diseases such as disorder on lever, gall bladder and pancreas.There is a tendency that people want to use therapy by natural materials,increases demand of turmeric seed as raw material of medicine industry inIndonesia. This condition provides a chance to farmers as supplier of plantmaterials. However, up to now, the high need of plant materials causes thelimitation of supply so that their alternatives are needed for providing plantmaterials in maximum number. The part of plant material provision in highnumber and in a short time and free from pests and diseases can beconducted through tissue culture technique. However, this technique islimited by the high cost of multiplication, among others the use ofchemical materials. Therefore, the use of growth regulator originated fromnatural material as substitution of synthetic growth regulator need to beassessed, one of them is coconut water. The experiment was carried out atthe laboratory of Tissue Culture, Germ Plasm, and Plant Breeding,Indonesia for Medicinal and Aromatic Crop Research Institute, Bogorfrom May to December 2009. Explants originated from sterile turmericshoots, product of previous multiplication. Media used was Murashige andSkoog (MS) combined with several concentration levels of coconut water( 0; 5; 10; 15, and 20%) as substitution of growth regulator and coconutwater by using millipore. Solid media was used, as comparison on mediaof chemical MS + was BA1.5 mg/l. The experiment was arranged incompletely randomized design with 10 replications. Parameters observedwere the numbers of shoots, leaves and roots. Results showed that withoutchemical component, by addition of coconut water on variousconcentrations on based media of MS, produced shoots, leaves and roots.The highest shoot number obtained on combination of media and additionof coconut water 15% as many as 3.4 shoots, with the number of leaves2.2 leaves at the age of 2 weeks and the highest roots formed on 15 %coconut water as many as 13.2 roots. Whereas on combination of mediawith millipore, the highest shoots were only 2.6 shoots, however it was notsignificantly different from treatment of control MS + BA 1.5 mg/l, itproduced 2.6 shoots,3.6 leaves and 15.4 roots.Key words : Curcuma xanthorrhiza Roxb., in vitro, coconut water,growth regulator, multiplication in vitro

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Dervis, S., M. Arslan, C. U. Serce, S. Soylu e I. Uremis. "First Report of a Root Rot Caused by Phytophthora palmivora on Lavandula angustifolia in Turkey". Plant Disease 95, n. 8 (agosto 2011): 1035. http://dx.doi.org/10.1094/pdis-04-11-0306.

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English Lavender (Lavandula angustifolia Mill.) has been considered an alternative crop to tobacco in Hatay Province of Turkey because of its great production potential. As a new, nonnative crop, diseases and pests of lavender are not well known in the region. In summer 2010, root rot symptoms were observed with an average incidence of 45% in a 2-year-old lavender nursery in Hatay. Initial symptoms of chlorosis and wilting were followed by progressive death of the plants starting at the shoot tips. An oomycetous species was isolated consistently from the stems and roots of diseased plants on potato dextrose agar (PDA) amended with several fungicides and antibiotics. The culture of the single-zoospore isolate produced arachnoid growth on PDA. Chlamydospores of the isolate were approximately 35.0 μm in diameter. The isolate produced papillate, caduceus, hyaline sporangia in different shapes ranging from spherical to ellipsoidal. Sporangia with short pedicels (5 μm) were 35.0 to 57.5 × 27.5 to 42.5 μm with a length/width ratio of 1.2 to 1.8. On the basis of symptoms and morphology of the organism, the pathogen was identified as Phytophthora palmivora (E.J. Butler) E.J. Butler (3). Identification of the isolate was also confirmed by comparison of the sequence of the nuclear ribosomal internal transcribed spacer (ITS) region with reference isolates. The ITS region of rDNA was amplified by PCR with primers ITS1/ITS4 and sequenced (GenBank Accession No. JF777117). BLAST analysis of the sequence obtained showed a 99 to 100% homology with P. palmivora. Pathogenicity tests were performed on 12 greenhouse-grown 2-year-old lavender plants in 2-liter pots containing a steamed sand/peat/soil mixture. After rooting, the plants were inoculated by placing mycelial plugs from a 1-week-old culture of the isolate into an incision made at the base of each plant. Control plants were treated with plugs of sterile PDA. Inoculated plants were kept at 27°C for 5 weeks. Similar symptoms developed on the inoculated plants within 4 weeks after inoculation. P. palmivora was consistently reisolated from symptomatic plants. No symptoms developed on control plants. P. palmivora attacks a wide range of crop species including lavenders (1,2,4). To our knowledge, this is the first report of a root rot caused by P. palmivora, a new pathogen of lavender in Turkey. References: (1) S. Davino et al. Plant Dis. 86:561, 2002. (2) D. C. Erwin and O. K. Ribeiro. Phytophthora Diseases Worldwide. The American Phytopathological Society, St Paul, MN, 1996. (3) D. J. Stamps. C.M.I. Descr. Fungi Bact. 831:1, 1985. (4) G. A. Torres et al. Plant Dis. 94:1163, 2010.

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Camelo R., Mauricio, Sulma Paola Vera M. e Ruth Rebeca Bonilla B. "Mecanismos de acción de las rizobacterias promotoras del crecimiento vegetal." Corpoica Ciencia y Tecnología Agropecuaria 12, n. 2 (23 novembre 2011): 159. http://dx.doi.org/10.21930/rcta.vol12_num2_art:227.

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La dinámica poblacional de la especie humana ha llevado a que la explotación de los recursos naturales, en búsqueda de suplir las necesidades alimenticias de los miles de millones de personas que habitan el planeta. Esta necesidad ha llevado a la utilización de materiales de alta eficiencia en la agricultura, variedades vegetales resistentes a plagas y enfermedades con ciclos de producción más cortos, agroquímicos que surten las necesidades nutricionales y provean protección frente factores bióticos adversos (plagas y enfermedades). Sin embargo, estas estrategias utilizadas en la agricultura moderna han generado impactos ambientales negativos que aún no comprendemos. La contaminación de aguas freáticas, eutrofización, aumento de gases de invernadero y acumulación de sustancias toxicas en la cadena trófica, son algunos de los graves problemas que se presentan por el uso indiscriminado de agroquímicos. Como alternativa a la utilización de estas sustancias, se ha propuesto el uso de bacterias rizosféricas que tienen reconocida acción sobre el crecimiento y desarrollo vegetal (PGPR, por sus siglas en ingles). Estas bacterias son capaces de estimular el desarrollo de las plantas de manera directa e indirecta y poseen una serie de mecanismos complejos que interactúan entre sí para establecer relaciones benéficas, especialmente con las raíces de las plantas objetivo. El estudio y entendimiento de las PGPR han sido temas de gran importancia en muchas investigaciones a nivel mundial, por esta razón esta revisión tiene por objetivo hacer una revisión parcial para dar a conocer los mecanismos que poseen las rizobacterias promotoras del crecimiento vegetal en el desarrollo de las plantas, así como el papel que desempeñan en el ciclaje de nutrientes. Mechanisms of action of plant growth promoting rhizobacteria.The population dynamics of the human race has led to the exploitation of natural resources in search of a way to meet the nutritional needs of the billions of people inhabiting the planet. This need has led to the use of high-efficiency materials in agriculture, plant varieties with shorter production cycles that are also resistant to pests and diseases, and chemicals that provide protection against biotic factors (pests and disease), additionally the nutrients required to grow plants. However, the strategies used in modern agriculture have led to negative environmental impacts that we have yet to fully understand. Groundwater contamination, eutrophication, increased greenhouse gases, and the accumulation of toxic substances in the food chain are some of the serious problems that have arisen worldwide due to the indiscriminate use of agrochemicals. As an alternative to the use of these substances, the use of rhizopheric bacteria has been proposed owing to its known action as plant growth- promoting bacteria (PGPB). These bacteria are able to stimulate plant growth directly and indirectly and have several complex mechanisms that interact with each other to establish beneficial relationships, especially with the roots of target plants. The study and understanding of PGPR have been the subjects of great importance in many studies at a global level. This review, therefore, aims to better understand the mechanisms of plant growth-promoting rhizobacteria on plant development and their role in nutrient cycling.

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Balakrishnan, Rengasamy, Duk-Yeon Cho, In Su-Kim e Dong-Kug Choi. "Dendropanax Morbiferus and Other Species from the Genus Dendropanax: Therapeutic Potential of Its Traditional Uses, Phytochemistry, and Pharmacology". Antioxidants 9, n. 10 (8 ottobre 2020): 962. http://dx.doi.org/10.3390/antiox9100962.

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The Dendropanax genus is a kind of flowering plant in the family of Araliaceae that encompasses approximately 91 to 95 species. Several Dendropanax species are used as traditional medicinal plants, extensively used Korea and South America and other parts of the world. Almost every part of the plant, including the leaves, bark, roots, and stems, can be used as traditional medicine for the prevention and management of a broad spectrum of health disorders. This paper sought to summarizes the ethnopharmacological benefits, biological activities, and phytochemical investigations of plants from the genus Dendropanax, and perhaps to subsequently elucidate potential new perspectives for future pharmacological research to consider. Modern scientific literature suggests that plants of the Dendropanax genus, together with active compounds isolated from it, possess a wide range of therapeutic and pharmacological applications, including antifungal, anti-complement, antioxidant, antibacterial, insect antifeedant, cytotoxic, anti-inflammatory, neuroprotective, anti-diabetic, anti-cancer, and anti-hypouricemic properties. The botanical descriptions of approximately six to 10 species are provided by different scientific web sources. However, only six species, namely, D. morbiferus, D. gonatopodus, D. dentiger, D. capillaris, D. chevalieri, and D. arboreus, were included in the present investigation to undergo phytochemical evaluation, due to the unavailability of data for the remaining species. Among these plant species, a high concentration of variable bioactive ingredients was identified. In particular, D. morbifera is a traditional medicinal plant used for the multiple treatment purposes and management of several human diseases or health conditions. Previous experimental evidence supports that the D. morbifera species could be used to treat various inflammatory disorders, diarrhea, diabetes, cancer, and some microbial infections. It has recently been reported, by our group and other researchers, that D. morbifera possesses a neuroprotective and memory-enhancing agent. A total of 259 compounds have been identified among six species, with 78 sourced from five of these species reported to be bioactive. However, there is no up-to-date information concerning the D. morbifera, its different biological properties, or its prospective benefits in the enhancement of human health. In the present study, we set out to conduct a comprehensive analysis of the botany, traditional medicinal history, and medicinal resources of species of the Dendropanax genus. In addition, we explore several phytochemical constituents identified in different species of the Dendropanax genus and their biological properties. Finally, we offer comprehensive analysis findings of the phytochemistry, medicinal uses, pharmacological actions, and a toxicity and safety evaluation of the D. morbifera species and its main bioactive ingredients for future consideration.

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Hill, G. N., W. R. Henshall e R. M. Beresford. "Manipulating rainfall to study symptom expression of Botrytis cinerea infection in wine grapes". New Zealand Plant Protection 70 (26 luglio 2017): 301–9. http://dx.doi.org/10.30843/nzpp.2017.70.64.

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Botrytis cinerea infection of wine grapes can result in a variety of symptoms. The most common symptom is botrytis bunch rot (BBR), where infected berries rot and shrivel, and eventually produce fungal sporulation. Another symptom is slip skin, where the skins of infected ripe berries slide easily from the pulp. It is hypothesised that a reduction in osmotic potential in grape berries due to late-season rainfall leads to slip skin symptom development. Hyphal growth of B. cinerea on osmotically adjusted agar was inhibited at osmotic potentials associated with near-ripe berries. Vine sheltering was used in a research vineyard to manipulate rainfall artificially and to alter berry sugar content in Vitis vinifera Sauvignon blanc vines, with the aim of increasing osmotic potential and altering symptom expression. Both BBR and slip skin symptoms were affected by the various sheltering conditions, with sheltered vines having lower BBR and higher slip skin at harvest. REFERENCES Becker T, Grimm E, Knoche M 2012. Substantial water uptake into detached grape berries occurs through the stem surface. Australian Journal of Grape and Wine Research 18: 109-114. https://doi.org/10.1111/j.1755-0238.2011.00177.x Beever RE, Laracy EP 1986. Osmotic adjustment in the filamentous fungus Aspergillus nidulans. Journal of Bacteriology 168: 1358-1365. https://doi.org/10.1128/jb.168.3.1358-1365.1986 Beresford RM, Hill GN 2008. Botrytis control without fungicide residues - is it just a load of rot? New Zealand Winegrower 12: 104-106. Beresford RM, Evans KJ, Wood PN, Mundy DC 2006. Disease assessment and epidemic monitoring methodology for bunch rot (Botrytis cinerea) in grapevines. New Zealand Plant Protection 59: 355-360. Bondada BR, Matthews MA, Shackel KA 2005. Functional xylem in the post-vÃ©raison grape berry. Journal of Experimental Botany 56: 2949-2957. https://doi.org/10.1093/jxb/eri291 Choat B, Gambetta GA, Shackel KA, Matthews MA 2009. Vascular function in grape berries across development and its relevance to apparent hydraulic isolation. Plant Physiology 151: 1677-1687. https://doi.org/10.1104/pp.109.143172 Clarke SJ, Hardie WJ, Rogiers SY 2010. Changes in susceptibility of grape berries to splitting are related to impaired osmotic water uptake associated with losses in cell vitality. Australian Journal of Grape and Wine Research 16: 469-476. https://doi.org/10.1111/j.1755-0238.2010.00108.x Diakou P, Moing A, Svanella L, Ollat N, Rolin DB, Gaudillere M, Gaudillere JP 1997. Biochemical comparison of two grape varieties differing in juice acidity. Australian Journal of Grape and Wine Research 3: 1-10. https://doi.org/10.1111/j.1755-0238.1997.tb00122.x Grolemund G, Wickham H 2011. Dates and times made easy with lubridate. 2011 40: 25. Harris RF 1981. Effect of water potential on microbial growth and activity. In: Parr JF, Gardner WR, Elliott LF eds. Water Potential Relations in Soil Microbiology. SSSA Special Publication. Soil Science Society of America. Pp. 23-95. Hill GN, Beresford RM, Evans KJ 2010. Tools for accurate assessment of botrytis bunch rot (Botrytis cinerea) on wine grapes. New Zealand Plant Protection 63: 174-181. Hill GN, Evans KJ, Beresford RM 2014a. Use of nitrate non-utilising (nit) mutants to determine phenological stages at which Botrytis cinerea infects wine grapes causing botrytis bunch rot. Plant Pathology 63: 1316-1325. https://doi.org/10.1111/ppa.12225 Hill GN, Evans KJ, Beresford RM, Dambergs RG 2014b. Comparison of methods for the quantification of botrytis bunch rot in white wine grapes. Australian Journal of Grape and Wine Research 20: 432—441. https://doi.org/10.1111/ajgw.12101 Keller M, Smith JP, Bondada BR 2006. Ripening grape berries remain hydraulically connected to the shoot. Journal of Experimental Botany 57: 2577-2587. https://doi.org/10.1093/jxb/erl020 Loschiavo A, Scholefield P, Morrison J, Ferris M 2010. The cost of pests and diseases to the Australian winegrape industry. Australian Viticulture 14: 15-19. McCarthy MG, Coombe BG 1999. Is weight loss in ripening grape berries cv. Shiraz caused by impeded phloem transport? Australian Journal of Grape and Wine Research 5: 17-21. https://doi.org/10.1111/j.1755-0238.1999.tb00146.x Mendiburu Fd 2016. agricolae: Statistical Procedures for Agricultural Research. https://CRAN.R-project.org/package=agricolae. Mundy DC, Beresford RM 2007. Susceptibility of grapes to Botrytis cinerea in relation to berry nitrogen and sugar concentration. New Zealand Plant Protection 60: 123-127. Nelson KE 1956. The effect of Botrytis infection on the tissue of Tokay grapes. Phytopathology 46: 223-229. NIWA 2017. Mean monthly rainfall (mm). https://www.niwa.co.nz/education-and-training/schools/resources/climate/meanrain (05-05-2017). Pezet R, Viret O, Perret C, Tabacchi R 2003. Latency of Botrytis cinerea Pers.: Fr. and biochemical studies during growth and ripening of two grape berry cultivars, respectively susceptible and resistant to grey mould. Journal of Phytopathology 151: 208-214. https://doi.org/10.1046/j.1439-0434.2003.00707.x R Core Team 2016. R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. https://www.R-project.org/. R Studio Team 2016. RStudio: Integrated Development for R. RStudio, Inc., Boston, MA. http://www.rstudio.com/. Rogiers SY, Smith JA, White R, Keller M, Holzapfel BP, Virgona JM 2001. Vascular function in berries of Vitis vinifera (L) cv. Shiraz. Australian Journal of Grape and Wine Research 7: 47-51. https://doi.org/10.1111/j.1755-0238.2001.tb00193.x Schindelin J, Arganda-Carreras I, Frise E, Kaynig V, Longair M, Pietzsch T, Preibisch S, Rueden C, Saalfeld S, Schmid B, Tinevez J-Y, White DJ, Hartenstein V, Eliceiri K, Tomancak P, Cardona A 2012. Fiji: an open-source platform for biological-image analysis. Nature Methods 9: 676-682. https://doi.org/10.1038/nmeth.2019 Smart R, Robinson M 1991. Sunlight into Wine. Winetitles, Adelaide, Australia. Taiz L, Zeiger E 1998. Plant Physiology. Sinauer Associates, Sunderland, MA, USA. Tyerman SD, Tilbrook J, Pardo C, Kotula L, Sullivan W, Steudle E 2004. Direct measurement of hydraulic properties in developing berries of Vitis vinifera L. cv Shiraz and Chardonnay. Australian Journal of Grape and Wine Research 10: 170-181. https://doi.org/10.1111/j.1755-0238.2004.tb00020.x Whiting EC, Rizzo DM 1999. Effect of water potential on radial colony growth of Armillaria mellea and A. gallica isolates in culture. Mycologia 91: 627-635. https://doi.org/10.2307/3761248 Wickham H 2009. ggplot2: Elegant Graphics for Data Analysis. Springer-Verlag New York. Wickham H 2016. tidyverse: Easily Install and Load 'Tidyverse' Packages. https://CRAN.R-project.org/package=tidyverse. Wickham H, Bryan J 2017. readxl: Read Excel Files. https://CRAN.R-project.org/package=readxl. Wilcox WF, Gubler WD, Uyemoto JK 2015. Compendium of Grape Diseases, Disorders, and Pests: Second Edition. APS Press, St Paul, MN, USA.

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LUCAS, J. A. "Advances in plant disease and pest management". Journal of Agricultural Science 149, S1 (22 dicembre 2010): 91–114. http://dx.doi.org/10.1017/s0021859610000997.

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SUMMARYPests and diseases impact on crop yield and quality, and also reduce resource-use efficiency. Improved crop protection strategies to prevent such damage and loss can increase production and make a substantial contribution to food security. DNA-based technologies are likely to greatly increase the speed, sensitivity and accuracy of pest and pathogen detection and diagnosis. Rapid sequencing of nucleic acids from infected plants will aid identification of novel disease agents. Biomarkers of disease or crop damage such as volatile chemicals or blends may also be used to detect pest outbreaks. Biosensors coupled to information networks will provide real-time monitoring and surveillance of crops or stored produce and hence early warning of emerging problems and new invasive species. Challenges remain in the dissemination of new technologies and information to resource poor farmers in developing countries, although the rapid extension of the internet, mobile phones and other communication networks will provide new opportunities. Defining the genetic and molecular basis of innate plant immunity has been a major advance in plant biology with the potential to identify new targets for intervention via novel chemistry or genetic modification (GM). Identification of regulatory genes, signal molecules, pathways and networks controlling induced plant defence should lead to the development of a new generation of defence modulators, delivered either as crop protection products, or via biological agents on seeds or in the root zone. There should also be opportunities to select more responsive crop genotypes, or to develop transgenic crops tailored to respond to specific chemical cues or molecular patterns diagnostic for particular biotic threats. Sequencing of the genomes of the major crop species and their wild relatives will expand enormously the known gene pool and diversity of genetic resources available for plant breeders to access. It should be possible to identify genomic regions and genes conferring more durable, quantitative resistance to pathogens. The breeding cycle will be accelerated by high-throughput phenotyping and more efficient selection of resistance traits using within-gene markers. GM approaches will facilitate pyramiding (combining) resistance genes with different specificities and modes of action, thereby reducing the risk of directional selection for virulence. Analysis of the genomes of plant pathogens and invertebrate pests is already providing new information on genes, gene families and processes involved in host colonization and pathogenicity. Comparative genomics of species with diverse host ranges, contrasting feeding habits and different pathogenic lifestyles will identify new targets for inhibiting pest attack and aid the development of novel antimicrobial drugs and pesticides. Understanding the natural ecology of pests and pathogens, such as the factors determining host location, resource exploitation and interactions with other organisms, will improve our ability to manipulate behaviour, or exploit natural enemies or other antagonists of pest species. Volatile signals, either from natural plant sources, or engineered in transgenic crops, will be more widely used to modify pest behaviour. It may also be possible to manipulate microbial communities regulating pathogen populations and activity, and thereby recruit and retain more effective biocontrol agents. Insights into the natural diversity and activity of soil and microbial populations in the zones surrounding roots and seeds will provide new information on mechanisms of suppression regulating pest species. Fully effective interventions are unlikely, due to the complexity and diversity of the soil system, but there should be progress towards integrated control regimes combining more resistant crop genotypes (either selected or GM) with targeted management of natural suppressive processes. Harnessing new technologies and knowledge to create more durable resistant crops and sustainable disease and pest management systems will require improved understanding of the factors driving pest and pathogen adaptation and evolution. There must also be an increased emphasis on translational research and delivery, and developing strategies appropriate for lower-input production systems, if the second ‘green revolution’ is to become a reality.

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Sparks, Darrell. "Adaptability of Pecan as a Species". HortScience 40, n. 5 (agosto 2005): 1175–89. http://dx.doi.org/10.21273/hortsci.40.5.1175.

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Pecan [Carya illinoinensis (Wangenh.) C. Koch] is indigenous to the Mississippi River drainage system of the United States. Climate in the native pecan region ranges from humid to semiarid and from mild to harsh winters. Rainfall is bimodal with peaks in March to April and in August to September. Pecan is site specific and is the climax tree species on loamy, well drained, first bottom river land with a relatively high water table. Detrimental effects from pecan's shade intolerance from its more vigorous, sympatric species are minimized as these species are specific to differ sites. Pecan's deep and phreatophytic rooting habit ensures soil moisture during drought periods and facilitates pecan's survival in semiarid regions. Root development in the humus-surface layer ensures nutrient uptake from the most nutrient rich layer of the soil and, when the lower soil profile is saturated, aeration for the roots and water and nutrient uptake. The bimodal rain pattern replenishes soil profile moisture and its timing ensures seed germination, stand establishment, well-developed seed, and minimal drought stress. Natural selection for freeze tolerance and for minimum fruit development time allows survival in areas with harsh winters and short growing seasons. Regulation of seed germination and budbreak by heating and chilling results in pecan being native in cold and warm climates, greatly increasing the native range. The northern limit for pecan is dictated by heat units; the southern limit is restricted by lack of bimodal rains and vivipary. Reproductive stress is caused by the high lipid content of seed, but is counteracted by a long juvenile growth period of the seedling, by a small nut size and low percentage kernel, and by “off” production years of the tree. Nut and percentage kernel decrease as the growing season decreases which contributes to species survival in geographical regions with a short growing season. Selection for small nuts with low percentage kernel is enhanced by predators. Tree reserves are depleted by heavy production during “on” years and are replenished during “off”years. Perpetuation of pecan forests is apparently from sib/half sib seedlings following predator satiation while dissemination into new areas may be mainly by predators. Pecan and its pests successfully co-exist. Major defense against fruit feeders is escape in time, leaf feeders by biological associations and accommodation, and leaf diseases by confrontation. Heterozygous progenies from cross-pollination provide ample genetic diversity for continuous pecan selection to endure pressures imposed throughout a wide climatic range. Ecological adaptions within native pecan forests should be used in developing and maintaining commercial pecan orchards.

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Przetakiewicz, J. "First Report of New Pathotype 39(P1) of Synchytrium endobioticum Causing Potato Wart Disease in Poland". Plant Disease 99, n. 2 (febbraio 2015): 285. http://dx.doi.org/10.1094/pdis-06-14-0636-pdn.

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Potato wart disease, caused by Synchytrium endobioticum (Schilb.) Perc., is one of the most dangerous diseases of cultivated potato. S. endobioticum is an obligate soil-borne fungus. The pathogen originated in the Andean zones of South America, from which it spread to North America and Europe at the end of the nineteenth century. The typical symptoms of cauliflower-like galls can develop on all meristematic tissues of potato except roots. The pathogen is on the European and Mediterranean Plant Protection Organization (EPPO) A2 list of quarantine pests. Since the discovery of pathotype 2(G1) in Germany, more than 40 pathotypes have been reported in Europe (1). In 2009, warted tubers were collected from Lesser Poland. Direct microscopic examination confirmed the presence of summer and winter sporangia in galls. The galls were multiplied on cv. Eersteling using the Glynne-Lemmerzahl method (GL), according to EPPO standard PM 7/28 (3). To identify the pathotype of S. endobioticum, 10 differential potato cultivars were inoculated with fresh galls following the GL method. The reaction types were evaluated 4 weeks after incubation in sand in a growth chamber. Cultivars Combi, Delcora, Deodara, Eersteling, Miriam, Producent, and Tomensa were extremely susceptible (predominant tumor formation); cv. Karolin was slightly susceptible (small galls with numerous winter sporangia); and cvs. Saphir and Ulme were resistant (early and late defense necrosis). This virulence profile was different from patterns of known European (1), Turkish (2), and Polish local pathotypes (4,5). The virulence of the pathogen to cv. Karolin was unique. Winter sporangia were isolated from galls formed on cv. Karolin and used in a modified Potoček's tube test (5) to obtain fresh galls with summer sporangia that were necessary to reconfirm the virulence profile of the pathotype. The reaction of all cultivars to the new pathotype was the same after the GL was performed. In accordance with the summation of known pathotypes, it is proposed to encode this new pathotype as pathotype 39(P1), using an Arabic number to designate the subsequent pathotype (the last one, 38 [Nevşehir], was identified in Turkey) (2) and the first letter of the locality where it was found (Piekielnik). The presence of pathotype 39(P1) was confirmed in four out of six districts where the Polish local pathotype 2(Ch1) was prevalent. The virulence profiles of both pathotypes were compared using differential set and cv. Asche Sämling, which is differential only for pathotype 2(Ch1). In contrast to all other pathotypes (big galls), no galls were observed on A. Sämling inoculated with pathotype 2(Ch1) and 39(P1). From this observation it appears that the new pathotype probably has been selected from the Polish local pathotype 2(Ch1). Pathotype 39(P1) was detected in small garden potato plots in the rainy mountainous area, a non-economically important potato-growing region where the old traditional cultivars of potato are cultivated without crop rotations. It seems, therefore, that where climatic conditions are suitable for S. endobioticum and the growing of slightly susceptible cultivars is possible, development of the new pathotype is favored. References: (1) R. P. Baayen et al. Eur. J. Plant Pathol. 116:21, 2006. (5) E. Çakir et al. OEPP/EPPO Bull. 39:175, 2009. (2) EPPO. EPPO Bull. 34:213, 2004. (3) J. Przetakiewicz. Biull. IHAR 257/258:207, 2010. (4) J. Przetakiewicz. Plant Dis. 98:688, 2014.

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Harveson, R. M., e M. D. Bolton. "First Evidence of a Binucleate Rhizoctonia as the Causal Agent of Dry Rot Canker of Sugar Beet in Nebraska". Plant Disease 97, n. 11 (novembre 2013): 1508. http://dx.doi.org/10.1094/pdis-04-13-0375-pdn.

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Sugar beet (Beta vulgaris L.) is the primary source of domestic sucrose in the United States. In 2011, a sugar beet field in Morrill County, NE, was noted with wilting and yellowing symptoms suggestive of Rhizoctonia root and crown rot (RRCR), an important disease of sugar beet primarily caused by Rhizoctonia solani anastomosis group 2-2 (4). While the foliar symptoms were consistent with RRCR, the symptoms on the root were not. Root symptoms consisted of localized, dry, sunken lesions covering brown spongy tissue penetrating deeply into taproots. The surface tissues of the cankers distinctively produced a series of concentric circles. These root symptoms are inconsistent with RRCR, but are suggestive of a rarely occurring disease known as dry rot canker (DRC). DRC was first identified from Utah in 1921 (1), and assumed at the time to be caused by an uncharacterized strain of R. solani. It has since been sporadically but empirically noted from most western sugar beet growing states (4), but little is known about the pathogen or disease due to its infrequent appearances. To investigate the etiology of this disease, necrotic lesion borders were excised from diseased taproots, surface disinfested in 1% (v/v) sodium hypochlorite for 90 s, rinsed with distilled water for 90 s, and after drying on sterile tissue paper, placed on half-strength potato dextrose agar (½PDA) and incubated at 25 to 27°C. After 24 to 36 h, Rhizoctonia-like fungal growth was readily observed emerging from tissue pieces. Resulting colonies were tan to light brown. The ITS region of the rDNA was amplified from 4 isolates obtained from 4 distinct lesions and roots using the ITS1 and ITS4 primers (3) with standard PCR conditions, and sequenced (GenBank KC842197 to KC842200). The ITS regions were 100% identical between the 4 isolates and 96% (E-value = 0.0) identical to binucleate Rhizoctonia and Ceratobasidium sp. AG-F (e.g., JF519832, FR734295, JF705217). Hyphal cells were observed to be binucleate after staining 48-h-old cultures with lactophenol blue. Therefore, these isolates were identified to be a binucleate Rhizoctonia group AG-F based on morphological and molecular characteristics. Although distinct from DRC, a similar phenomenon has been recently reported from China implicating binucleate Rhizoctonia species with seedling disease in sugar beets (2). To determine pathogenicity of DRC isolates, 1- and 2-month-old sugar beet plants grown in 10 cm pots (5 plants per pot with 4 replications per isolate) were inoculated with all 4 isolates by placing 3 mycelial plugs (8 mm diameter) taken from the leading edge of ½PDA plates onto the soil surface of each pot. PDA plugs were utilized as controls. After ~3 weeks, root lesions resembling DRC were observed and isolates were recovered and identified from diseased plants as described above. No symptoms developed on control plants. To our knowledge, this is the first formally confirmed report of DRC on sugar beets in more than 75 years from the Western Hemisphere. The original investigator suspected that the isolates he found inducing this disease were different from typical R. solani isolates based on different symptoms (1). Our results, based on different symptoms but also with distinct molecular, biological, and pathogenicity traits, validate those suspicions while also fulfilling Koch's postulates with binucleate Rhizoctonia AG-F pathogenic to sugar beet that is distinct from the more common R. solani. References: (1) B. L. Richards. J. Agric. Res. 22:47, 1921. (2) P. P. Wang and X. H. Wu. Plant Dis. 96:1696, 2012.(3) T. J. White et al. Academic Press, San Diego, CA. 1990. (4) C. E. Windels et al. Rhizoctonia Root and Crown Rot. Page 33 in: Compendium of Beet Diseases and Pests. R. M. Harveson et al., eds. APS Press, St. Paul, MN, 2009.

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Rante, C. S., D. T. Sembel, E. R. M. Meray, M. M. Ratulangi, M. F. Dien e D. S. Kandowangko. "PENGGUNAAN INSEKTISIDA BOTANIS UNTUK MENGENDALIKAN HAMA PADA TANAMAN TOMAT". EUGENIA 19, n. 2 (2 agosto 2013). http://dx.doi.org/10.35791/eug.19.2.2013.7374.

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ABSTRACT The experiment was conducted in the village of Touure, Tompaso District, Minahasa regency since April to August 2013. Designed studies using randomized block design with 3 treatments, namely fruit extract Bitung (treatment A), tuba root extract (treatment B) and water (control treatment), each treatment was repeated 3 times. Results showed that that the extract of Barringtonia asiatica and Derris elliptica has a botanical insecticide to control the properties of N. tenuis. Applications B. asiatica extract and D. elliptica were not significantly different, but both are significantly different from controls. In addition to N. tenuis found several Plant Pest Organisms (OPT) that attack tomato plants including pest Liriomyza sp., leafhoppers tomatoes., black stem base diseases, leaf spot diseases and viral diseases. Key words : Botanic Insecticide, Tomato pest control ABSTRAK Penelitian dilaksanakan di Desa Toure, Kecamatan Tompaso, Kabupaten Minahasa sejak bulan April sampai dengan Agustus 2013. Penelitian dirancang menggunakan Rancangan Acak Kelompok dengan 3 perlakuan yaitu ekstrak buah bitung (perlakuan A), ekstrak akar tuba (perlakuan B) dan air (perlakuan kontrol) yang masing-masing perlakuan diulang sebanyak 3 kali. Hasil penelitian menunjukkan bahwa bahwa ekstrak Barringtonia asiatica dan Derris elliptica memiliki sifat insektisida botanis untuk mengendalikan N. tenuis. Aplikasi ekstrak B. asiatica dan D. elliptica tidak berbeda nyata, namun keduanya berbeda nyata dengan kontrol. Selain N. tenuis ditemukan juga beberapa Organisme Pengganggu Tanaman (OPT) yang menyerang tanaman tomat diantaranya hama Liriomyza sp., wereng tomat., penyakit pangkal batang hitam, penyakit bercak daun dan penyakit virus. Kata kunci : Insektisida botanis, pengendalian hama tanaman tomat

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Fronza, Diniz, Jonas Janner Hamann, Vanderlei Both, Rogério de Oliveira Anese e Evandro Alcir Meyer. "Pecan cultivation: general aspects". Ciência Rural 48, n. 2 (1 febbraio 2018). http://dx.doi.org/10.1590/0103-8478cr20170179.

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ABSTRACT: Given the increasing investment in the pecan production in southern Brazil, it becomes necessary researches, assisting in solve problems and proposition of technical and methodology to enhance this production chain. Thus, the present review aimed to survey the existing information about the culture, both on the world and the Brazilian scene. Issues related to botany, climate and soil requirements, alignment and planting density, cultivars, pests and diseases, among other technical aspects of this culture will be addressed. Pecan nut presents nutraceutical properties that are beneficial to human health, which has increased its demand from consumers. However, there are few research results with pecan nut in Brazil and there are many gaps in scientific knowledge about this culture, especially as regards the management of pests and diseases control, irrigation and nutrition, in Brazilian conditions.

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ALFRED MAROYI. "A REVIEW OF BOTANY, THERAPEUTIC VALUE, PHYTOCHEMISTRY, AND PHARMACOLOGY OF CUSSONIA PANICULATA". Asian Journal of Pharmaceutical and Clinical Research, 4 luglio 2019, 1–6. http://dx.doi.org/10.22159/ajpcr.2019.v12i9.34434.

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Cussonia paniculata is a small tree widely used as herbal medicine throughout its distributional range in southern Africa. This study is aimed at providing a critical review of the botany, biological activities, phytochemistry, and medicinal uses of C. paniculata. Documented information on the botany, biological activities, medicinal uses, and phytochemistry of C. paniculata was collected from several online sources which included BMC, Scopus, SciFinder, Google Scholar, Science Direct, Elsevier, PubMed, and Web of Science. Additional information on the botany, biological activities, phytochemistry, and medicinal uses of C. paniculata was gathered from pre-electronic sources such as book chapters, books, journal articles, and scientific publications sourced from the University library. This study showed that the bark, fruits, leaves, roots, and stems of C. paniculata are used as emetic, immune booster, and herbal medicine for dysmenorrhea, intestinal parasites and worms, mental problems, boils, shingles and skin diseases, indigestion and stomach complaints, sores, and wounds. Phytochemical compounds identified from the leaves of C. paniculata include acetylated triterpene glycosides, unacetylated triterpene glycosides, flavonoid, steroidal saponin, and triterpenoid saponins. Pharmacological research revealed that C. paniculata extracts have analgesic, antibacterial, anticancer, anti-inflammatory, antiplasmodial, antiprotozoan, Aβ42 protein reduction, and cytotoxicity activities. Future research should focus on evaluating the phytochemical, pharmacological, and toxicological properties of C. paniculata crude extracts as well as compounds isolated from the species.

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