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Zeitschriftenartikel zum Thema "Harvest diseases"
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Wall, Marisa M., und Joe N. Corgan. „MATURITY AND STORAGE EFFECTS ON POSTHARVEST ONION QUALITY“. HortScience 28, Nr. 5 (Mai 1993): 578c—578. http://dx.doi.org/10.21273/hortsci.28.5.578c.
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A two-year field study was conducted to evaluate the effects of maturity and storage on fresh market onion quality. Four short day onion cultivars (NuMex BR1, NuMex Sunlite, NuMex Starlite and Buffalo) were seeded in early October of both years. Bulbs were harvested at 5 different times, with harvest #1 when 20% of the bulbs in a plot had mature necks. The second harvest was when 80% of the bulbs in a plot had matured. Harvests #3, #4 and #5 were at 5, 10 or 15 days after the second harvest date. After curing, bulb firmness and weight, and the incidence of bulb diseases were evaluated for the 5 harvest dates. Bulbs were re-evaluated after 10 and 20 days storage in a shed under ambient conditions. Average bulb weight increased from 181.6g to 274.1g as harvest was delayed. Bulb firmness decreased from 56N to 52N. Percent diseased bulbs increased for all cultivars as harvest was delayed in 1991, while in 1992 this trend was not observed. In storage, average bulb weight and firmness decreased, while the incidence of bulb diseases increased greatly regardless of harvest date. Storage diseases were primarily Aspergillus niger and bacterial soft rot.
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Wall, Marisa M., und Joe N. Corgan. „Postharvest Losses from Delayed Harvest and during Common Storage of Short-day Onions“. HortScience 29, Nr. 7 (Juli 1994): 802–4. http://dx.doi.org/10.21273/hortsci.29.7.802.
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A 2-year field study was conducted to evaluate the effects of maturity and storage on fresh-market onion (Allium cepa L.) quality. Four short-day onion cultivars (`NuMex BR1', `NuMex Sunlite', `NuMex Starlite', and `Buffalo') were seeded in early October each year. Bulbs were harvested at five times; the first and second harvests were when 20% and 80 %, respectively, of the bulbs in a plot had mature necks; the third, fourth, and fifth harvests were at 5,10, and 15 days after the second harvest date, respectively. After curing for 3 days, bulb firmness, weight, and incidence of disease were evaluated for all harvests. Bulbs were re-evaluated after 10 and 20 days storage in a shed under ambient conditions. `Buffalo' and `NuMex Surdite' bulbs had the lowest incidence of disease before storage. For all cultivars, average bulb weight increased and firmness decreased with delayed harvest. Percent diseased bulbs increased for all cultivars as harvest was delayed in 1991 but not in 1992. The optimum harvest time was at 80% maturity. In storage, average bulb weight and firmness decreased, and the incidence of bulb diseases increased.
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Silva, Emylli Pereira e., Egon Henrique Horst, Everton Luiz Carneiro Pereira, Julio Cezar Heker Junior, Daniel Corrêa Plodoviski und Mikael Neumann. „Influence of the fungicide strobilurin on forage rye production under different harvesting systems“. Semina: Ciências Agrárias 43, Nr. 5 (14.07.2022): 2109–22. http://dx.doi.org/10.5433/1679-0359.2022v43n5p2109.
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The goal of this study was to evaluate the effects of successive harvests, with or without application of foliar fungicide, on the morphometric characteristics, yield and nutritional value of rye forage harvested at the hard dough grain stage, aiming at silage production. The preventive control of foliar diseases was carried out with the fungicide OrkestraTM SC®, in a single application, at early flowering, for both harvesting systems. The first harvest was conducted at the full vegetative stage and the second, at the hard dough grain stage. The system with two harvests resulted in higher cumulative yield compared with the single-harvest system (40,680 and 9,029 kg ha-1 fresh and dry biomass with two harvests, against 8,816 and 5,375 kg ha-1 fresh and dry biomass). Fungicide application promoted a reduction in neutral detergent fiber content in both systems, with values of 753.9 against 790.6 g kg-1 for the single-harvest system and 734.4 against 773.3 g kg-1 for the two-harvest system, with and without fungicide, respectively. For lignin content, the application of the fungicide reduced values (97.2 against 110.3 g kg-1) only in the two-harvest system. Rye management with a harvest at the vegetative stage increases the cumulative dry biomass yield without negatively affecting the harvest yield at the hard dough grain stage, and without drastic changes in the nutritional value of the plant. Even under adverse conditions, fungicide application positively interferes with plant cell wall components
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J V N, Lakshmi, und Satya Siddharth Panda. „Post-Harvest on Citrus Fruit Analyzing the Disease Type in Early Stages Using the Image Processing“. International Journal of Engineering Research in Computer Science and Engineering 9, Nr. 8 (06.08.2022): 44–48. http://dx.doi.org/10.36647/ijercse/09.08.art009.
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Image processing is a significant scientific tool for assessing food quality by using computer vision techniques. Plants are susceptible to diseases while practicing post-harvest technology. Detecting the diseases using the hyperspectral image segmentationtechnique by interpreting the external appearance and segmenting the diseased fruit is the current study. Particularly oranges the citrus fruits are highly vulnerable to post-harvest diseases such as brown rot, canker, scab, and greening due to high cold storage and also some of the pre-harvest factors. Classification of citrus typically orange fruit by identifying the disease by using the feature extraction by discovering different dimensions. Early detection of the diseases in the fruit prevents the fast spread and also reduces damage and financial loss. In the contemporary study on post-harvest disease detection in citrus fruits, a dataset of citrus diseased images is used and are easily classified with 79% of accuracy
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Roshan, Kanaklata, Ritam Dutta, Bhaskar Roy und Chiranjib Goswami. „Smart Harvest Diseases Identification using Image Processing“. IOP Conference Series: Materials Science and Engineering 1228, Nr. 1 (01.03.2022): 012006. http://dx.doi.org/10.1088/1757-899x/1228/1/012006.
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Abstract Manual identification of leaf or fruit diseases is nearly impossible when it comes to large scale production, and it is a very time-consuming task that also requires a large amount of manpower. Hence, the existing technology is used where the disease identification is done within minutes. When a code is developed and deployed in any of the surveillance drones, a large-scale area can be covered in minutes and with less manpower. Here, in this proposal, there are two methods proposed. One is using the keywords and the other method is where a classifier is trained with the database available and the classifier with the highest accuracy is tested against the test set and a result is obtained. When there is a huge area of land, manually identifying the leaf diseases may require a lot of manpower and also be time-consuming. Hence, deploying this code in any sprayer drone will help in identifying the diseases within minutes. Along with disease identification, the particular longitude and latitude of the disease affected leaves’ location will be saved due to the fact that when the land is huge, the farmer need not go in search of the location; instead, a drone will fly to the exact location and the respective fertiliser will be sprayed. Before identification of leaf disease, a photo of the diseased leaves will be captured, due to which, by looking at the picture, the farmer can decide whether medication is necessary or not.
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Chandra, R. Jeya, P. Masilamani, B. Suthakar, P. Rajkumar, S. D. Sivakumar und V. Manonmani. „Effect of Moisture Content on Combine Harvested Seed Crop and its Quality“. Journal of Experimental Agriculture International 46, Nr. 3 (24.02.2024): 114–38. http://dx.doi.org/10.9734/jeai/2024/v46i32331.
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The moisture content during harvesting significantly influences post-harvest losses, encompassing factors that collectively diminish both the quantity and quality of agricultural produce. These factors involve pre-harvest sprouting, mechanical damages and susceptibility to diseases at post-harvest. To mitigate the risks associated with excessive moisture, farmers have to employ proper harvesting techniques such as using a combine harvester. The combine harvester proves invaluable by efficient harvesting, threshing and winnowing various crops like rice, corn, wheat, sunflower and pulses directly in the field. This streamlined process not only saves time and reduces the need for human labour but also lowers overall work costs for farmers. Additionally, the utilization of these machines enhances agricultural productivity, ensuring a more efficient harvesting process and contributing to greater profitability in farming practices. Consequently, effective moisture content management becomes essential for minimizing losses and preserving seed quality. A multipurpose nature of a combine harvester minimizes the need for manual labour in harvesting, leading to a reduction in workforce requirements, time expenditure and effort. Consequently, this enhances overall productivity. The objective of the present review is to describe the effect of moisture content on crop, machine and operational parameters on seed quality of combine harvested crops and discussed the effect of moisture content on mechanical damage of combine harvested seed crop and its germination potential and seedling vigour.
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Hamim, I., MZ Alam, MA Ali und M. Ashrafuzzaman. „Incidence of post-harvest fungal diseases of ripe papaya in Mymensingh“. Journal of the Bangladesh Agricultural University 12, Nr. 1 (20.12.2014): 25–28. http://dx.doi.org/10.3329/jbau.v12i1.21235.
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A survey was conducted during November, 2012 to May, 2013 to assess the status of major post harvest diseases of papaya fruits in the local markets of Mymensingh. Average percentage of diseased fruits at the markets were 29.83 and diseased fruits ranged from 20.40% to 38.04% during the study period. Highest percentage of diseased fruits (38.04%) was recorded in the month of May, 2013 followed by March, 2013 (37.98%). The minimum percentage of diseased fruits (20.40%) was recorded in January, 2013 followed by December (22.68%). Total six post-harvest diseases was recorded, viz. Anthracnose, Fusarium rot, Stem end rot, Rhizopus rot, Aspergillus rot and Penicillium rot. Anthracnose showed highest mean incidence (14.17 %) followed by Fusarium rot (7.26%) where as Pencillium rot showed lowest mean incidence (0.70%). In the market, anthracnose showed maximum percentage of mean disease abundance (46.11%) followed by Fusarium rot (24.61%). The findings of this study revealed that total six post-harvest diseases are associated with ripe papaya in different markets of Mymensingh. Moreover, May is the predominant month of highest incidence and abundance of all diseases. DOI: http://dx.doi.org/10.3329/jbau.v12i1.21235 J. Bangladesh Agril. Univ. 12(1): 25-28, June 2014
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López-Pérez, Andres M., Benjamin Plourde, Katie Smith, Francesca Rubino, Emily Pascoe, Olivia Smith und Janet Foley. „Impacts of Timber Harvest on Communities of Small Mammals, Ticks, and Tick-Borne Pathogens in a High-Risk Landscape in Northern California“. Journal of Medical Entomology 58, Nr. 3 (18.01.2021): 1171–87. http://dx.doi.org/10.1093/jme/tjaa297.
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Abstract Timber harvest may impact tick-borne disease by affecting small mammal and tick community structures. We assessed tick and small mammal populations in older second-growth redwood (Sequoia sempervirens (D. Don) Endl) habitat at two harvested sites in Santa Cruz County, California, where local risk of tick-borne disease is high and determined the prevalence of tick-borne pathogens in ticks. After single-tree removal harvest in 2014, there was a modest reduction in canopy, primarily toward the end of the study. Harvested sites showed strong reductions in California mouse (Peromyscus californicus, (Gambel)) captures 2-yr after harvest, resolving such that treatments and controls were comparable by the end of the study. Following harvest, treated sites experienced a transient decreased tick infestation while control plots experienced an increase. Ixodes angustus (Neumann) infestation probability on harvested plots decreased immediately after harvest, increasing with time but remaining lower than control plots, whereas I. pacificus (Cooley and Kohls) prevalence was higher shortly after the harvest on harvested plots, and continued to increase. Mean abundance of ticks on vegetation increased on control plots. We detected Borrelia burgdorferi ((Johnson et al.) Baranton) and Anaplasma phagocytophilum ((Foggie 1949) Dumler) in 3.8 and 3.1% of ticks on rodents, but no differences were associated with harvest. Impacts of forest harvest on tick-borne disease depend on removal practice and intensity, whether or not hosts are habitat specialists, and whether or not ticks are host specialists.
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Ismail, Mohamed, und Jiuxu Zhang. „Post-harvest Citrus Diseases and their control“. Outlooks on Pest Management 15, Nr. 1 (01.02.2004): 29–35. http://dx.doi.org/10.1564/15feb12.
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Barad, Shiri, Edward Sionov und Dov Prusky. „Role of patulin in post-harvest diseases“. Fungal Biology Reviews 30, Nr. 1 (April 2016): 24–32. http://dx.doi.org/10.1016/j.fbr.2016.02.001.
Der volle Inhalt der QuelleDissertationen zum Thema "Harvest diseases"
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Govender, Veloshinie. „Evaluation of biological control systems for control of mango post-harvest diseases“. Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-02102006-160747.
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Cotty, P. J. „Effect of Harvest Date on Aflatoxin Contamination in the Yuma Valley“. College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/208308.
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Experiments were performed at the Yuma Valley Agricultural Center to determine how timely harvest of cotton may affect aflatoxin contamination of cottonseed As the cotton was held in the field between the final irrigation and harvest, the quantity of aflataxin in the crop increased. Significant reductions in aflatoxin contents of seed were realized by harvesting in early September.
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Misaghi, I. J., P. J. Cotty und D. M. DeCianne. „Management of Pre-Harvest Aflatoxin Contamination of Cottonseed Using Beneficial Bacteria“. College of Agriculture, University of Arizona (Tucson, AZ), 1993. http://hdl.handle.net/10150/209536.
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The overall goal of our study is to find effective and environmentally sound methods to reduce pre -harvest aflatoxin contamination of cottonseed in Arizona. The specific objectives are: 1) to screen a large number of bacteria for their ability to destroy the aflatoxin producing fungus, Aspeigillus flavus; 2) to test the efficacy and consistency of the recovered antagonistic bacterial isolates to reduce aflatoxin contamination of cottonseed in field trials; 3) to study the survival and competitiveness of the antagonists on cotton plants under prevailing field conditions; 4) to find innovative procedures to enhance survivability and competitiveness of the antagonists on cotton plants; and 5) to test the potential of the bacterial antagonists to reduce the population of A. flavus in field soils. Over 800 bacterial isolates, recovered from cotton field soils, cotton leaves, stems, and immature as well as opened bolls, were tested for ability to inhibit the growth of A. flavus on cottonseed. Six isolates partially or totally inhibited the fungus. All of these effective isolates prevented the fungus fioin infecting simulated pink bollworm exit holes in immature bolls in the field.
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Lotze, Elmi. „Pre-harvest determination of bitter pit potential in apples“. Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1291.
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Thesis (PhD(Agric) (Horticulture))--University of Stellenbosch, 2005.Bitter pit fruit in commercial consignments of apples still poses an economic threat to exporters from South Africa. Bitter pit develops pre-harvest, but gets progressively worse during storage and is only traceable once the lesions appear after storage. Accurate, early indications of bitter pit incidence will allow for remedial pre-harvest measures in the field, e.g. Ca foliar applications, to reduce the potential losses. Similarly, the automatic detection of a bitter pit fruit during packing will reduce financial losses by identifying unacceptable fruit before shipping. Fluorescence imaging is a fast, non-destructive technique, able to evaluate numerous fruits individually. Results of pre-harvest imaging on apples to identify fruit susceptible to bitter pit showed that pitted fruit were correctly classified, but misclassification of non-pitted fruit with fluorescence imaging was still too high. NIR-spectroscopy point meter readings could distinguish visible bitter pit lesions from healthy tissue. Important wavelengths associated with visible bitter pit were identified. This technique could also identify immature apples, more prone to bitter pit development. It could however not distinguish between bitter pit and non-pitted fruit when applied randomly on the calyx end of apples at harvest. Pre-harvest foliar applications to increase fruit Ca content and reduce bitter pit incidence, is a standard practice world wide. External Ca uptake by fruit was monitored to determine the efficacy of applications during different stages of fruit development. Two periods of efficient uptake of external Ca were identified, viz., cell division and the last few weeks before harvest. Foliar Ca applications from 40 days after full bloom were more effective in increasing fruit Ca content and reducing bitter pit incidence than at 80 days after full bloom, which was recommended previously. Mineral analysis of fruit has been used with variable success to predict bitter pit prior to harvest. The possibility of increasing the accuracy of existing predictive models by using analysis of individual fruit rather than pooled samples, was investigated. By improving the normality of different mineral distributions and decreasing the overlap between pitted and non-pitted fruit classes, it was attempted to improve the reliability of predictions based on variable threshold values. The Ca distribution showed a variation between pitted and nonpitted classes, but still a significant overlap between classes reduced the accuracy of the predictive capacity of this distribution. Even though our results produced a correct classification of 85% for non-pitted fruit, which can be useful, this was still below the required tolerance, of less that 2%, expected on the market. The effect of pruning and fruit bearing position on two-year-old wood on dry mass and Ca allocation of fruit was determined. ‘Golden Delicious’ fruit set was the lowest at the basal bearing position compared to the other positions evaluated and was contrary to expectations. Fruit in a terminal bearing position was superior to the basal position regarding total dry weight and fruit size. Distal wood possibly inhibited growth and set on the basal position via auxin distribution. Ca allocation differed between seasons and cultivars and could either be influenced by bearing position or presence or absence of re-growth.
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Nayak, Rajesh R. „Foodborne pathogens in poultry production and post-harvest control“. Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1266.
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Thesis (Ph. D.)--West Virginia University, 2000.Title from document title page. Document formatted into pages; contains x, 180 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
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Pretorius, Danielle. „Antimicrobial lipopeptide production by Bacillus spp. for post-harvest biocontrol“. Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96117.
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Thesis (MEng) -- Stellenbosch University, 2014.ENGLISH ABSTRACT: As overpopulation threatens the world’s ability to feed itself, food has become an invaluable resource. Unfortunately, almost a third of the food produced for human consumption is lost annually. Pests including insects, phytopathogens and weeds are responsible for more than a third of the annual major crop losses suffered around the world. The majority of current post-harvest control strategies employ synthetic agents. These compounds, however, have been found to be detrimental to the environment as well as human health, which has led researchers to investigate alternative strategies. Biocontrol agents are environmentally compatible, have a lower toxicity and are biodegradable, making them an attractive alternative to the synthetic control agents. The lipopeptides produced by Bacillus spp. in particular, have shown great potential as biocontrol agents against various post-harvest phytopathogens. Most biocontrol strategies apply the biocontrol organism, for example Bacillus, directly, whereas this study focused on the use of the lipopeptide itself as an antifungal agent. This is advantageous as the lipopeptides are less sensitive to their surroundings, such as temperature and pH, compared to living organisms, allowing for the production of a standardized product. This study investigated the production of the Bacillus lipopeptides surfactin, fengycin and iturin under controlled batch conditions. Parameters increasing lipopeptide production were quantified, focussing on antifungal lipopeptides (iturin and fengycin), and lipopeptide production was optimized. Experiments were performed in a fully instrumented 1.3 L bench-top bioreactor and lipopeptide analyses were performed via high pressure liquid chromatography (HPLC) and liquid chromatography-mass spectroscopy (LC-MS). After screening four Bacillus spp., Bacillus amyloliquefaciens DSM 23117 was found to be the best antifungal candidate. This was based on it outperforming other candidates in terms of maximum antifungals produced, Yp/x,antifungals (yield per cells), and antifungal productivity. Nitrate, in the form of NH4NO3, was critical for lipopeptide production and an optimum concentration was observed above which the CDW (cell dry weight) no longer increased significantly and both μmax (maximum specific growth rate, h-1) and lipopeptide production decreased. For μmax, the optimum NH3NO4 concentration was 10 g/L and for lipopeptides it was 8 g/L. At these respective NH4NO3 concentrations μmax = 0.58 (h-1), the maximum antifungals (fengycin and iturin) were 285.7 mAU*min and the maximum surfactin concentration was 302 mg/L. The lipopeptides produced by B. amyloliquefaciens, the antifungals (fengycin and iturin) and surfactin, are secondary metabolites, regardless of the optimization treatment, i.e. increased NH4NO3 concentrations. Using 30% enriched air extended the nitrate utilization period, suggesting that when increasing supply concentration, more oxygen was available to act as electron acceptors, allowing nitrate to be used for lipopeptide production. The number of iturin and fengycin homologues generally increased with an increase in nitrate concentration. This suggested that process conditions, such as nitrate concentration, can be used to manipulate homologue ratios, allowing for the possibility to tailor-make biocontrol-agent upstream, during the production process, and possibly increase the efficacy of the biocontrol strategy. The lipopeptides produced by B. amyloliquefaciens showed complete inhibition against Botryotinia fuckeliana and diminished the growth capabilities of Botrytis cinerea. No inhibition was observed against Penicillium digitatum. These results indicate potential of the biocontrol strategy, although scale-up and fed-batch studies are recommended, especially when considering commercial implementation. Studies regarding the lipopeptide application method, i.e. a single application or multiple applications, should also be investigated as this will influence the efficacy of the lipopeptides against the target organisms.
AFRIKKANSE OPSOMMING: Met oorbevolking wat die wêreld se vermoë om die groeiende bevolking te onderhou belemmer, het dit noodsaaklik geword om huidige voedselbronne te beskerm. Daar word beraam dat een derde van die voedsel wat wêreldwyd geproduseer word vir menslike verbruik verlore gaan elke jaar. Verder is insekte, plantpatogene en onkruide verantwoordelik vir meer as ‘n derde van die verliese rakend jaarlikse oeste. Meeste bestaande na-oes beheermetodes maak gebruik van sintetiese stowwe. Ongelukkig kan hierdie verbindings nadelig wees vir die omgewing sowel as menlike gesondheid. Navorsers het hulsef dus toespits daarop om alternatiewe beheermetodes te ondersoek. Bio-beheermetodes is omgewingsvriendelik sowel as bio-afbreekbaar, wat hulle ideale alternatiewe maak vir die sintetiese stowwe. Bacillus spp. lipopeptiede het veral hoë potensiaal getoon as bio-beheermiddels teen verskeie na-oes plantsiektes. Meeste bio-beheermetodes wend die biobeheer organisme, soos Bacillus, direk aan, waar hierdie studie op die gebruik van lipopeptiede as ‘n beheermiddel gefokus het. Die voordeel is dat lipopeptidiede minder sensitief is vir hul omgewings, soos temperatuur en pH, i.v.m. organismes en die moontlikheid bied van ‘n gestandardiseerde produk. Hierdie studie het die produksie van spesifieke Bacillus lipopeptide, naamlik surfactin, fengycin en iturin, onder beheerde lottoestande ondersoek. Parameters wat lipopeptied produksie verhoog is gekwantifiseer, spesifiek antifungiese middels (iturin en fengycin) en lipopeptied produksie is geoptimeer. Eksperimente is uitgevoer in ‘n 1.3 L bioreaktor en lipopeptiedanaliese is met behulp van hoë druk vloeistof chromatografie en vloeistofchromatografie-massa spektroskopie uitgevoer. Van die vier moontlike Bacillus spp., was Bacillus amyloliquefaciens DSM 23117 die mees belowende antifungus-produserende kandidaat. Dit het beter resultate gelewer in terme van maksimale antifungiese produksie, Yp/x,antifungies (opbrengs per sel) asook antifungiese produktiwiteit. Nitraat, in hierdie geval NH4NO3, was noodsaaklik vir lipopeptied produksie en ‘n optimale konsentrasie is waargeneem waarbo die seldigtheid nie meer beduidend toegeneem het nie en beide die μmax (maksimale spesifieke groei tempo, h-1) en lipopeptied produksie afgeneem het. Die optimale NH4NO3 konsentrasie vir μmax was 10 g/L en vir lipopeptiedproduksie was 8 g/L. By 10 g/L NH4NO3 was μmax = 0.58 (h-1) en by 8 g/L was die maksimale antifungiese produksie (fengycin en iturin) 285.7 mAU*min en die maksimale surfactin produksie 302 mg/L onderskeidelik. Die lipopeptide, die antifungiese middels (fengycin en iturin) en surfactin, geproduseer deur B. amyloliquefaciens is sekondêre metaboliete, ongeag van die optimerings-behandelinge wat toegepas word, soos ‘n verhoging in NH4NO3 konsentrasie. Die gebruik van 30% verrykte suurstof het die nitraat verbruikingsperiode verleng, wat voorgestel het dat met die verryking, meer suurstof beskikbaar was om te dien as finale elektron ontvanger en sodoende die nitraat beskikbaar te stel vir lipopeptied produksie. Iturin en fengycin homoloë, oor die algemeen, het toegeneem soos wat die nitraat konsentrasie verhoog is. Hierdie resultate dui daarop dat prosestoestande, soos nitraat konsentrasie, gebruik kan word om die verhouding waarin lipopeptied homoloë geproduseer word te manipuleer. Hierdie resultate dui op die potensiaal vir die stroomop produksie van ‘n unieke bio-beheermiddel, wat die effektiwiteit van die bio-beheermetode moontlik sal verhoog. Die geproduseerde lipopeptiede het totale inhibisie getoon teen Botryotinia fuckeliana en ook fungiese aktiwiteit belemmer met Botrytis cinerea. Geen inhibisie is getoon teen Penicillium digitatum nie. Hierdie resultate toon die potensiaal van die bio-beheermetode, maar ‘n opskalerings-studie asook ‘n voerlot studie word aanbeveel, veral met die oog op moontlike kommersiële implementering van die strategie. Verdere studies met betrekking tot die aanwendingsmetode van die lipopeptiede moet ook verder ondersoek word, m.a.w. enkel teenoor menigte aanwendigs, aangesien dit die effektiwiteit van die lipopeptiede teen die teikenorganismes sal beïnvloed.
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Ottman, Michael, und Ayman Mostafa. „Summer Slump in Alfalfa“. College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2014. http://hdl.handle.net/10150/311219.
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3 pp.“Summer slump” is a decline in growth of alfalfa usually beginning in July in areas where maximum daily temperature exceeds 100 °F, such as the low elevation deserts of Southwestern U.S (Fig. 1). In more temperate regions, there is a gradual decrease in alfalfa yield in successive harvests throughout the year, but the yield decline in the summer is not as sharp as in hot summer regions. The term summer slump has also been applied to reduction in growth of perennial cool season grasses such as tall fescue during the summer.
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Teles, Cesar Simas 1974. „Storage of seedless table grapes exposed to high CO2 concentrations for short period followed by controlled atmosphere, associated or not with pre-harvest application of CaCI2 or CIO2 = Conservação de uvas apirências submetidas a curta exposição de altas concentrações de CO2, seguida de armazenamento sob atmosfera controlada, associada ou não à aplicação de CaCI2 ou CIO2 na pré colheita“. [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256783.
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Orientador: Benedito Carlos BenedettiTexto em português e Inglês
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agrícola
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Resumo: Botrytis cinerea Pers, causador da doença conhecida como mofo cinzento, é o principal problema para a conservação pós-colheita de uvas de mesa. A utilização do dióxido de enxofre (SO2) é a prática pós-colheita mais comum para o controle desta doença. Pesquisas buscam alternativas a este produto devido às reações que causa em pessoas alérgicas, danos que pode causar nos frutos e às restrições ao seu uso em sistemas de produção orgânico. Foram avaliados os efeitos da aplicação de uma atmosfera de 40% de CO2 por 24 ou 48 horas (pré-armazenagem) combinado com armazenagem em atmosfera controlada (AC) (12% O2 + 12% CO2) no controle de B. cinerea, e nos atributos de qualidade de uvas 'Flame Seedless' e 'Crimson Seedless'. Também foram avaliados, em uvas 'Crimson Seedless', e os efeitos da associação deste tratamentos com aplicações pré-colheita de cloreto de cálcio (CaCl2) ou dióxido de cloro (ClO2). Os tratamentos foram aplicados em uvas orgânicas infectadas de três formas: infectadas naturalmente, superficialmente inoculadas com conídios e inoculadas com uma baga coberta de micélio. Uvas 'Flame Seedless', naturalmente infectadas, tratadas com 40% de CO2 por 48 horas + AC apresentaram redução da podridão pós-colheita, de 22% para 0,6%, após 4 semanas, e de 100% para 7,4%, após 7 semanas. O pré-armazenamento em 40% de CO2 sozinho também limitou a incidência de mofo cinzento em frutos infectados naturalmente e em uvas inoculadas artificialmente, porém foi menos eficaz do que quando seguido pelo armazenamento em AC. A aplicação de CaCl2 ou ClO2 em pré-colheita reduziu a incidência do mofo cinzento em uvas 'Crimson Seedless' inoculadas com uma solução de conídios, porém não houve controle quando os cachos de uva foram inoculados com micélio. A aplicação de CaCl2 e ClO2 reduziram o mofo cinzento de 45% para 23,2% e 15.6%, respectivamente, em cachos inoculados com conídios e avaliados após 6 semanas armazenadas 0oC. O pré-tratamento com 40% CO2 + CA não afetou as características físico-químicas e sensoriais de uvas 'Crimson Seedless' ou 'Flame Seedless'. Em experimentos in vitro os tratamentos com 40% CO2 por 24 ou 48 h limitaram o crescimento micelial até 72 horas após o tratamento. A germinação dos conídios de B. cinerea foi retardada por 12h. Os resultados mostram que o pré-tratamento com 40% CO2 + CA possui grande potencial para ser adotado como prática comercial para conservação de uvas orgânicas
Abstract: Gray mold, caused by Botrytis cinerea Pers, is the main postharvest decay of table grapes. The use of sulfur dioxide (SO2) is the common post-harvest practice for its control. Several researchers are looking for alternative methods of control, because SO2 can cause allergic reactions, damage fruits and also it cannot be applied in organic production system. In this thesis, it was evaluated the effects of applying an atmosphere of 40% CO2 for 24 or 48 hours (pre-storage) combined with controlled atmosphere storage (CA = 12% O2 + 12% CO2) in the control of B. cinerea, and the effects in the quality and sensory attributes of 'Flame Seedless' and 'Crimson Seedless' table grapes. In addition, it was evaluated the efficacy of CaCl2 or ClO2 application in pre-harvest alone or in combination with pre-storage of 40% CO2 for 24 h + CA, to control gray mold on 'Crimson Seedless' table grapes, and the determination of the impact of these treatments on fruit quality. The treatments were applied in certified organic table grapes naturally infected, surface inoculated and nesting inoculated (inoculated with an infected berry). After 4 weeks of storage, the pre-storage in 40% CO2 for 48 hours + CA reduced postharvest rot from 22% to 0.6%, and after 7 weeks, the decay was reduced from 100% to 7.4% in 'Flame Seedless' naturally infected. The pre-storage in 40% CO2 alone also reduced the incidence of gray mold in fruits naturally infected and in artificially inoculated, but it was less effective than combined treatment. The application of CaCl2 or ClO2 pre-harvest reduced the incidence of gray mold on grapes 'Crimson Seedless' inoculated with a spore solution, but there was no control when fruits were nesting inoculated. After 6 weeks at 0oC, the application of CaCl2, and the ClO2 in fruits surface inoculated, reduced the gray mold from 45% to 23.2% and 15.6%, respectively. The pretreatment with 40% CO2 + CA did not affect quality and nor sensory attributes for both varieties tested. In vitro experiments, the treatment with 40% CO2 for 24 or 48 h limited mycelial growth for at least 72 hours after treatment. Conidial germination of B. cinerea was delayed for 12 hours. Our results showed the potential that pre-treatment with 40% CO2 associated with CA has to be adopted in commercial practice for preservation of organic grapes
Doutorado
Tecnologia Pós-Colheita
Doutor em Engenharia Agrícola
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Solorio, Monica Romero. „Avaliação sanitária da presença de doenças e caracterização dos padrões de caça de subsistência do queixada (Tayassu pecari) de vida livre na Amazônia Peruana“. Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-09082010-091858/.
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A queixada (Tayassu pecari) é um ungulado de grande importância tanto no sentido ecológico pelo seu rol vital na estruturação e composição das comunidades vegetais e para a conservação de ecossistemas bem como no sentido sócio-econômico, por ser fonte de alimento e renda para os caçadores de subsistência na Amazônia Peruana. Não obstante varias pesquisas relataram seu declínio em decorrência de sobre extração e citando a presença de epidemias como um problema potencial. Com o objetivo de avaliar a presença de doenças em populações de queixadas de vida livre e caracterizar os padrões de caça nesta espécie foi desenvolvido o presente estudo durante os anos 2008 e 2009 na Região de Madre de Dios. Foram coletados 103 soros provenientes de animais abatidos para caça de subsistência de duas comunidades indígenas e de animais capturados no interior de três áreas naturais protegidas. Os resultados evidenciaram a presença de anticorpos às doenças de brucelose, leptospirose, toxoplasmose, existindo diferencia na prevalência entre os locais de coleta. Esta corresponde à primeira avaliação sanitária de queixadas na Amazônia Peruana. Como parte complementar foram monitoradas as atividades de caça dos caçadores de subsistência das duas comunidades para caracterizar a área de caça utilizada, a produtividade, a pressão de caça e avaliar se a extração era sustentável. A caça das queixadas aparenta ser sustentável e a população caçada esta sendo adequadamente extraída em termos de sustentabilidade em longo prazo.The peccary (Tayassu pecari) holds an important place in the Amazonian ecosystem. As seed dispersers they have measurable effects on their habitat, partly guiding structure and composition of the vegetation community. Additionally, their socio-economic role is unsurpassed as one of the most important sources of bushmeat for subsistence hunters in the Peruvian Amazon. Various studies have alarmingly reported the decline of several populations, possibly a result of overextraction due to hunting. However, passing reference was also made to disease and its possible role in population fluctuations. The following study, taking place in Madre de Dios during 2008 and 2009, evaluates the presence of disease in three wild peccary populations. It is the first of its kind in the Peruvian Amazon. A complimentary study characterizing human hunting patterns of peccaries in two indigenous communities is also reported. Exactly 103 serum samples from hunted or live-captured animals were obtained for the study. The results indicate the presence of antibodies to brucelose, leptospirose, and toxoplasmose, in wild populations, the distribution of which is not equal among the three sites. The complimentary study characterizes human hunting patterns of peccaries, focusing on the delimitation of hunting grounds and the quantification of hunting pressure, annual animal productivity, and sustainability of hunting activities. Hunting pressure was found to be well within the limits of sustainability.
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Cruz, Thiago Alvizi. „Plantio de cana-de-açúcar e seus impactos na saúde respiratória de moradores no Noroeste do Estado de São Paulo“. Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/6/6134/tde-26082014-091706/.
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INTRODUÇÃO: O Estado de São Paulo é o maior produtor de cana-de-açúcar dentre os demais estados da federação, alcançando uma área de 5.768.184 hectares (ha) cultivada no ano de 2013. Diversos estudos desenvolvidos recentemente no Brasil apontam para os impactos negativos à saúde humana no processo de colheita por meio da queima da cana-de-açúcar. Em 2007, foi assinado o Protocolo de Cooperação (Protocolo do Etanol Verde) entre o setor sucroalcooleiro e o governo estadual visando à antecipação das metas de redução de queima de cana-de-açúcar por meio do processo de mecanização da colheita. Diante deste cenário, faz-se necessária uma análise sobre os impactos à saúde humana neste período de implantação de práticas sustentáveis. OBJETIVO: Este trabalho tem como objetivo avaliar o impacto da produção canavieira, após a assinatura do Protocolo Etanol Verde (2007), em alguns municípios do noroeste paulista por meio da análise das evoluções dos métodos de colheita da cana-de-açúcar possíveis associações com as doenças do aparelho respiratório. METODOLOGIA: . A área de estudo foi definida por meio de técnicas de análise espacial utilizando o software ARCGIS 10.1 com criação de shapefile de incidência de internações por doenças do aparelho respiratório por município e calculado o Índice Local de Moran, possibilitando a identificação dos municípios com maiores incidências e que formam aglomerados espaciais (clusters). Foram consolidados dados secundários de internações por doenças respiratórias em todos os municípios do Estado de São Paulo entre os anos de 2008 e 2012, levando em consideração o mês mais seco do ano (julho) para composição da incidência. Concomitantemente, os aspectos socioeconômicos e físicos relevantes foram caracterizados na área de estudo. Em seguida, foi realizada a análise espacial da distribuição dos métodos de colheita de cana-de-açúcar nos 25 municípios selecionados e foram definidas variáveis de risco associadas à distribuição espacial da colheita e que potencializam o impacto na saúde respiratória da população, levando-se em consideração o decreto 47.700, SMA - SAA 004/08 e outras referências. A partir dos dados levantados, correlações foram calculadas entre as variáveis,(Regressões lineares e correlação de Pearson, pBücher zum Thema "Harvest diseases"
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L, Ryan, Hrsg. Post-harvest tobacco infestation control. London: Chapman & Hall, 1995.
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Whittingham, Jo. Backyard harvest. New York: DK Pub., 2011.
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Snowdon, Anna L. A colour atlas ofpost-harvest diseases and disorders of fruits and vegetables. London: Wolfe Scientific, 1990.
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Snowdon, Anna L. Color atlas of post-harvest diseases and disorders of fruits and vegetables. Boca Raton: CRC Press, 1992.
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Snowdon, Anna L. A colour atlas of post-harvest diseases and disorders of fruit and vegetables. London: Wolfe Scientific, 1988.
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Wenham, J. E. Post-harvest deterioration of cassava: A biotechnology perspective. Rome: Food and Agriculture Organization of the United Nations, 1995.
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Snowdon, Anna L. A color atlas of post-harvest diseases and disorders of fruits and vegetables. Boca Raton, Fla: CRC Press, 1990.
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Snowdon, Anna L. A color atlas of post-harvest diseases and disorders of fruits and vegetables. Boca Raton, Fla: CRC Press, 1990.
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A colour atlas of post-harvest diseases and disorders of fruits and vegetables. London: Wolfe, 1991.
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Snowdon, Anna L. A color atlas of post-harvest diseases and disorders of fruits and vegetables. Boca Raton, Fla: CRC Press, 1990.
Den vollen Inhalt der Quelle findenBuchteile zum Thema "Harvest diseases"
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Janisiewicz, Wojciech J. „Quo Vadis of Biological Control of Postharvest Diseases“. In Post-harvest Pathology, 137–48. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8930-5_10.
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Teixidó, N., J. Usall, C. Nunes, R. Torres, M. Abadias und I. Viñas. „Preharvest Strategies to Control Postharvest Diseases in Fruits“. In Post-harvest Pathology, 89–106. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8930-5_7.
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Yang, Bi, Li Yongcai, Ge Yonghong und Wang Yi. „Induced Resistance in Melons by Elicitors for the Control of Postharvest Diseases“. In Post-harvest Pathology, 31–41. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8930-5_3.
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Sebastien, Massart, und Mohamed Haissam Jijakli. „Pichia anomala and Candida oleophila in Biocontrol of Postharvest Diseases of Fruits: 20 Years of Fundamental and Practical Research“. In Post-harvest Pathology, 111–22. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07701-7_10.
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Hariharan, G., L. M. Rifnas und K. Prasannath. „Role of Trichoderma spp. in Biocontrol of Plant Diseases“. In Microbial Biocontrol: Food Security and Post Harvest Management, 39–78. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87289-2_3.
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Snarski, Emilian, und Richard K. Burt. „Hematopoietic Stem Cell Mobilization, Collection, Apheresis, and Harvest Procedures“. In Hematopoietic Stem Cell Transplantation and Cellular Therapies for Autoimmune Diseases, 282–91. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781315151366-32.
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Arora, R. K., und Sanjeev Sharma. „Pre and Post Harvest Diseases of Potato and Their Management“. In Fungal Biology, 149–83. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1188-2_6.
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Asrey, Ram, und Amrita Das. „Effect of Pre-harvest Practices on Postharvest Quality and Diseases of Fruits“. In Postharvest Handling and Diseases of Horticultural Produce, 25–32. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003045502-2.
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Galgano, Letizia, Daphna Hutt und Hilda Mekelenkamp. „HSCT: How Does It Work?“ In The European Blood and Marrow Transplantation Textbook for Nurses, 25–43. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23394-4_2.
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AbstractThe HSCT (haematopoietic stem cell transplant) is a particular treatment for many haematological and non-haematological diseases. Broadly, there are three different categories of transplantation, autologous, allogeneic and syngeneic, which can be applied to most disease scenarios. Haematopoietic stem cells can be derived from the bone marrow, peripheral blood and umbilical cord blood. HSCT treatment can be divided into separate phases that start with the harvest of the stem cells and passing through the conditioning, aplasia and engraftment until the recovery of the haematopoietic functions. HSCT is indicated in many diseases, and these indications depend on numerous factors such as the disease type, stage and response to previous treatment. This chapter includes transplant in primary immunodeficiency in children, haemoglobinopathies as well as inherited bone marrow failure and inborn errors of metabolism.
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Qadri, Rashad, Muhammad Azam, Imran Khan, Yaodong Yang, Shaghef Ejaz, Muhammad Tahir Akram und M. Arslan Khan. „Conventional and Modern Technologies for the Management of Post-Harvest Diseases“. In Sustainability in Plant and Crop Protection, 137–72. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35955-3_7.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "Harvest diseases"
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Nocker, Maximilian, Gabriele Sottocornola, Markus Zanker, Sanja Baric, Greice Amaral Carneiro und Fabio Stella. „Picture-based navigation for diagnosing post-harvest diseases of apple“. In RecSys '18: Twelfth ACM Conference on Recommender Systems. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3240323.3241616.
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Chaisu, Korawit. „Biological Control of Post-Harvest Banana Diseases Using Antagonistic Bacteria in Thailand“. In 2018 IEEE 5th International Conference on Engineering Technologies and Applied Sciences (ICETAS). IEEE, 2018. http://dx.doi.org/10.1109/icetas.2018.8629130.
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Sottocornola, Gabriele, Maximilian Nocker, Fabio Stella und Markus Zanker. „Contextual multi-armed bandit strategies for diagnosing post-harvest diseases of apple“. In IUI '20: 25th International Conference on Intelligent User Interfaces. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3377325.3377531.
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Sottocornola, Gabriele, Fabio Stella und Markus Zanker. „Counterfactual Contextual Multi-Armed Bandit to Diagnose Post-Harvest Diseases of Apple“. In WI-IAT '21: IEEE/WIC/ACM International Conference on Web Intelligence. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3486622.3493926.
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Kochanova, D. E., und A. A. Mogilin. „THE INFLUENCE OF ELEMENTS OF AGRICULTURAL TECHNOLOGY ON THE INCIDENCE OF DISEASES IN SUNFLOWER“. In 11-я Всероссийская конференция молодых учёных и специалистов «Актуальные вопросы биологии, селекции, технологии возделывания и переработки сельскохозяйственных культур». V.S. Pustovoit All-Russian Research Institute of Oil Crops, 2021. http://dx.doi.org/10.25230/conf11-2021-189-192.
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Sunflower is one of the most important agricultural crops and is the main source of vegetable oil in Russia. The agrotechnical method plays an important role in protecting sunflower from diseases; it has a phytosanitary focus, includes a set of techniques that create conditions for good growth and development of sunflower and for unfavorable development, accumulation and spread of pathogens, which results in the production of high-quality sunflower seeds and, consequently, to the preservation of harvest.
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Trigubovich, A. M., F. A. Popov, A. A. Arashkova, I. G. Volchkevich und E. I. Kolomiyets. „Biopreparation "Vegetatin" for protection of cabbage from fungal and bacterial diseases during grows and storage“. In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.252.
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Effectiveness of usage biopreparation "Vegetatin" which is based on bacteria of the genus Bacillus to protect white cabbage from diseases was studied. Positive effect after treatments of seeds, seedlings and vegetative plants on the productivity and cabbage harvest has been established. Biological effectiveness of "Vegetatin" was at level of 48.9–53.6%, the stored yield –28.1 c/ha of cabbage heads. Processing of cabbage heads before storage reduced the damage of cabbage by mixed rots by an average of 30%.
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Iurcu-Straistaru, Elena, Nicola Sasanelli, Ion Toderas, Alexei Bivol, Vasile Maticiuc, Stefan Rusu und Cristina Andoni. „Investigations on invasive nematodes associated with complex insect pests from soil in corn in the environmental conditions of the Republic of Moldova“. In Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.36.
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Corn is one of the major technical field crops in the Republic of Moldova, advantageous in bioecological and productive aspects, which is invaded annually by the harmful organisms with considerable parasitic impact. The phytosanitary control results, carried out annually and seasonally, comparatively in the corn plantations, notice a significant diversity of the specific diseases and of the invasive insects that seriously affect the plants from the germination phases until the harvest. In corn, were established the numerical density values (D. n.), comparative in different ecological areas, on average 15-280 (ex. /100 g soil), with an abundance by 5-25% higher in the autumn than in the spring. Phytoparasitic impact indices the frequency (F %) and intensity (I %) of the phytohelminthological disease level was estimated, being more advanced by 3-30% in the spring-summer period, observed differently depending on the area compared to the autumn period. The structure of parasitic phytonematode complexes was determined counting 20 species, included in 8 families and one order (Tylenchida), classified according to trophic specialization, with the predominance of endo-ectoparasites. It was established the diversity of the associated invasive insect species from the soil: 12 species, 8 families, 3 orders, also, with invasive ectoparasitic impact on corn plants, with the disease degree of 5-40%, detected in all phases of vegetation and sectors investigated.
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Alzamora, Sebastian. „The Palm oil crop in Ecuador and its extraction“. In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/dqiq8597.
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The purpose of this presentation is to take you through the process of the Palm oil crop, harvest, and industrialization to obtain Crude Palm Oil (CPO).Palm oil crops started in Ecuador in 1950 and since then it has brought jobs, wealth and development to our society. Now, 80% of farmers have less than 50 hectares counting to a total of 256 000 hectares. Oil Palm tree is a perennial crop that starts production approximately 24 months after it is planted in the soil. It is harvested every 8 days all year round and it is one of the most versatile products in the world. All components of the fruit have a use for the mill and the plantation.There are two main varieties of Oil Palm trees, which require different tasks: Elaeis Guinesis and High Oleic Palm Tree which is more resistant to diseases, such as Bud Root (PC), and with a higher oil yield per area.Many tasks are needed to maintain the Palm Oil crop, which results in an optimal percentage of oil extraction in the Palm Oil Mill. Some tasks include: Weed cut around the plantation, the €œcorona€ to maintain the area around the palm tree clean, pruning of the leaves, fertilization, pest control and harvest.After harvest, the Oil Palm tree fruit goes into the mill. The extraction of the palm oil is carried out by mechanical means where the fruit first goes trough a sterilizer to soften the tissue and stop the acidification process. The bunch is separated in the fruit threshing drum, and then transported to the digester and twin-screw press where the oil is extracted by pressure. This oil is separated from water and palm cake in the Tridecanter. The process results in two main products: Crude Palm Oil (CPO) and Palm Kernel nut which goes to the Kernel Mill to extract Palm Kernel Oil (PKO), palm kernel cakeEcuador is the 10th biggest Palm Oil producer in the world and now, 19% of total crop area, and growing, is RSPO certified and an important producer of Organic Palm Oil.
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Bonani, Walter, Antonella Motta, Claudio Migliaresi und Wei Tan. „Biomolecule-Impregnated Nanocomposite With Spatiotemporal Control Over Release and Degradation Kinetic for Vascular Engineering“. In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19646.
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Autologous vessels are the gold standard for small-diameter (<6 mm) vascular bypass; however, many patients lack suitable autologous tissues due to diseases or prior vein harvest. As an alternative, synthetic vascular grafts made from bioinert synthetic materials such as polytetrafluoroethylene (PTFE) are currently used in the medical field. The high long-term failure rate of these materials in the replacement of small vessels is known to be associated with the lack of proper signalling events by PTFE to vascular cells causing adverse hemodynamic, inflammatory or coagulatory conditions. Therefore, constant and pressing is the demand for a more biocompatible conduit with structure and function similar to native vessels. For this reason, bioresorbable scaffold constructs which can provide not only proper mechanical support, but also precise molecular cues, are desired (1). In particular, proper degradation kinetics and molecule release profiles are needed to facilitate remodeling and integration process in vivo over the time for long-term patency (2).
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Sharghi, Hesam, Jean-François Daneault und Onur Bilgen. „A Wearable Biomedical Motion Sensor Employing a Vibration Energy Harvester“. In ASME 2019 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/smasis2019-5634.
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Abstract Wearable motion sensors find a great number of applications in the biomedical field by recording real-time movements and transferring data to mobile electronics. Patients with hyperkinetic movements is a group of interest for such sensors to survey their conditions for long periods. Longer and more frequent recording intervals are necessary to diagnose and treat patients’ disease. Mobile battery-operated motion sensors have a limited recording span, and they need to be charged frequently, which is inconvenient for most of the patients. In this study, vibration energy harvesters are employed to extend the battery life of motion sensors: one step closer to make autonomous sensors without chargers. A vibration energy harvester is designed for a motion sensor to harvest energy from involuntary movements of patients with hyperkinetic movements. An analytical model for charging and discharging cycles is developed to predict the battery life based on the amount of harvested power. Preliminary data from commercial devices are used as a foundation for the design and the current feasibility study.
Berichte der Organisationen zum Thema "Harvest diseases"
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Chalutz, Edo, Charles Wilson, Samir Droby, Victor Gaba, Clauzell Stevens, Robert Fluhr und Y. Lu. Induction of Resistance to Postharvest Diseases and Extension of Shelf-Life of Fruits and Vegetables by Ultra-Violet Light. United States Department of Agriculture, Februar 1994. http://dx.doi.org/10.32747/1994.7568093.bard.
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Following preliminary observations by one of the collaborating scientists on this project and the completion of a 1-year, BARD-supported feasibility study (IS-1908-90F), this 3-year BARD project has been executed. The main objectives of the research were to elucidate biochemical and pathological aspects of UV-induced resistance in fruits and vegetables, to characterize physical and biological variables of induced resistance and delay of ripening, and to explore the application of the treatment as a control practice of postharvest diseases and shelf-life extension of fruits and vegetables. Our findings, which are detailed in numerous joint publications, have shown that the effect of UV-C light on induction of resistance and delay of ripening is a general one and of wide oddurrence. Apart from surface sterilization of the commodity, the reduction of decay of different fungi has been associated with and induced resistance phenomenon which gradually builds up within 24 to 48 hours after the UV treatment and can be reversed by visible light. In citrus, induced resistance has been associated with increased activity of the enzymes phenylalanine ammonia-lyase and peroxidase, and with the levels of endglucanase and chitinase. In tomato, resistance was correlated with the production of high levels of tomatine. Our study of some molecular aspects of the induced resistance in grapefruit has revealed the induction of a cDNA which represents a gene encoding for an isoflavone reductase-like protein that, in legumes, has been associated with phytoalexin biosynthesis. This gene was cloned and sequenced. Delay of ripening was associated in tomato with inhibition of ethylene production, carotenoid synthesis, and chlorophyll degradation and with the presence of high levels of polyamines. In peach fruit epiphytic populations of a yeast increased following the UV treatment. Pilot-size treatment and packing lines were constructed in the US and Israel to test the application of the UV treatment on a semi-commercial scale. Although effective in reduction of decay and delay of ripening, a number of problems will have to be addressed before practical application of this methodology can be realized. The main issues are associated with the temporal and variable response to the treatment, and its relationship to the maturity and date of harvest of the commodity.
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Droby, Samir, Joseph W. Eckert, Shulamit Manulis und Rajesh K. Mehra. Ecology, Population Dynamics and Genetic Diversity of Epiphytic Yeast Antagonists of Postharvest Diseases of Fruits. United States Department of Agriculture, Oktober 1994. http://dx.doi.org/10.32747/1994.7568777.bard.
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One of the emerging technologies is the use of microbial agents for the control of postharvest diseases of fruits and vegetables. A number of antagonistic microorganisms have been discovered which have the potential to effectively control postharvest diseases. Some of this technology has been patented and commercial products such as AspireTM (Ecogen Corporatin, Langhorne, PA, USA), Biosave 10TM and Biosave 11TM (Ecoscience Inc., Worchester, MA, USA) have been registered for commercial use. The principal investigator of this project was involved in developing the yeast-based biofungicide-AspireTM and testing its efficacy under commercial conditions. This research project was initiated to fill the gap between the knowledge available on development and commercial implementation of yeast biocontrol agents and basic understanding of various aspects related to introducing yeast antagonists to fruit surfaces, along with verification of population genetics. The main objectives of this study were: Study ecology, population dynamics and genetic diversity of the yeast antagonists Candida guilliermondii, C. oleophila, and Debaryomyces hansenii, and study the effect of preharvest application of the yeast antagonist C. oleophila naturally occurring epiphytic microbial population and on the development of postharvest diseases of citrus fruit during storage. Our findings, which were detailed in several publications, have shown that an epiphytic yeast population of grapefruit able to grow under high osmotic conditions and a wide range of temperatures was isolated and characterized for its biocontrol activity against green mold decay caused by Penicillium digitatum. Techniques based on random amplified polymorphic DNA (RAPD) and arbitrary primed polymerase chain reaction (ap-PCR), as well as homologies between sequences of the rDNA internal transcribed spacers (ITS) and 5.8S gene, were used to characterize the composition of the yeast population and to determine the genetic relationship among predominant yeast species. Epiphytic yeasts exhibiting the highest biocontrol activity against P. digitatum on grapefruit were identified as Candida guilliermondii, C. oleophila, C. sake, and Debaryomyces hansenii, while C. guilliermondii was the most predominant species. RAPD and ap-PCR analysis of the osmotolerant yeast population showed two different, major groups. The sequences of the ITS regions and the 5.8S gene of the yeast isolates, previously identified as belonging to different species, were found to be identical. Following the need to develop a genetically marked strain of the yeast C. oleophila, to be used in population dynamics studies, a transformation system for the yeast was developed. Histidine auxotrophy of C. oloephila produced using ethyl methanesulfonate were transformed with plasmids containing HIS3, HIS4 and HIS5 genes from Saccharomyces cerevisiae. In one mutant histidin auxotrophy was complemented by the HIS5 gene of S. cerevisiae is functionally homologous to the HIS5 gene in V. oleophila. Southern blot analysis showed that the plasmid containing the S. cerevisiae HIS5 gene was integrated at a different location every C. oleophila HIS+ transformant. There were no detectable physiological differences between C. oleophila strain I-182 and the transformants. The biological control ability of C. oleophila was not affected by the transformation. A genetically marked (with b-glucuronidase gene) transformant of C. oleophila colonized wounds on orange fruits and its population increased under field conditions. Effect of preharvest application of the yeast C. oleophila on population dynamics of epiphytic microbial population on wounded and unwounded grapefruit surface in the orchard and after harvest was also studied. In addition, the effect of preharvest application of the yeast C. oleophila on the development of postharvest decay was evaluated. Population studies conducted in the orchard showed that in control, non-treated fruit, colonization of wounded and unwounded grapefruit surface by naturally occurring filamentous fungi did not vary throughout the incubation period on the tree. On the other hand, colonization of intact and wounded fruit surface by naturally occurring yeasts was different. Yeasts colonized wounded surface rapidly and increased in numbers to about two orders of magnitude as compared to unwounded surface. On fruit treated with the yeast and kept on the tree, a different picture of fungal and yeast population had emerged. The detected fungal population on the yeast-treated intact surface was dramatically reduced and in treated wounds no fungi was detected. Yeast population on intact surface was relatively high immediately after the application of AspireTM and decreased to than 70% of that detected initially. In wounds, yeast population increased from 2.5 x 104 to about 4x106 after 72 hours of incubation at 20oC. Results of tests conducted to evaluate the effect of preharvest application of AspireTM on the development of postharvest decay indicated the validity of the approach.
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Prusky, Dov, Noel Keen und John Browse. Modulation of the synthesis of the main preformed antifungal compound as abasis for the prevention of postharvest disease of C. gloeosporioides in avocado fruits. United States Department of Agriculture, Dezember 2001. http://dx.doi.org/10.32747/2001.7575273.bard.
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The most important pathological factor limiting fruit life after harvest in subtropical fruits are quiescent infections of anthracnose caused by Colletotrichum gloeosporioides. Prusky and Keen elucidated the mechanism of resistance in avocado fruits to quiescent infections of C. gloeosporioides and determined that the major biocide involved is the preformed compound,1-acetoxy-2-hydroxy-4-oxo-heneicosa-13, 15 diene. Two possibilities exist for maintaining fungitoxic levels of antifungal compounds in the tissue of ripening fruits: (i). Prevention of catabolism (ii). Induction of synthesis. Previous work has demonstrated that increased fruit susceptibility after fruit harvest occurs through diene catabolism mediated by oxidation of the antifungal compound by the enzyme lipoxygenase. Levels of a non-specific inhibitor, epicatechin, in turn, regulate activity of lipoxygenase, present in the peel of unripe but not ripe fruit. In this proposal, we examined the possibility of exploiting induced synthesis of the antifungal compound for the study of the synthetic pathway. The general objective of the present research was to study the mechanism of biosynthesis of natural antifungal compounds in order to regulate the process of resistance to postharvest diseases in ripening avocado fruits. The specific objectives of the research were: 1. To localize synthesis of the antifungal diene and modulate the process by biotic or a biotic elicitors. 2. To determine the relation between synthesis of the diene and accumulation in the peel and fruit resistance to decay 3. To characterize the biosynthetic pathway and the diene and the genes involved. The analysis of the antifungal compounds in avocado resulted in the detection of a new antifungal compound (E, Z, Z)-1-acetoxy-2-hydroxy-4-oxo- heneicosa-5, 12,15-triene. This new compound was shown to inhibit spore germination of C. gloeosporioides similarly as the antifungal diene. We had localized one of the biosynthetic places of these antifungal compounds in specialized idioblast cells (oil cells) in the mesocarp that can be easily enhanced by elicitors as ethylene. Results have also suggested that the antifungal compounds can be "exported" from the mesocarp to the pericarp where its main activity takes place. The search for the biosynthesis of antifungal compounds and the genes involved took two directions i. direct search for specific genes involved in the synthesis of the diene and ii. Indirect selection of genes using the differential display library. We have cloned , The most important pathological factor limiting fruit life after harvest in subtropical fruits are quiescent infections of anthracnose caused by Colletotrichum gloeosporioides. Prusky and Keen elucidated the mechanism of resistance in avocado fruits to quiescent infections of C. gloeosporioides and determined that the major biocide involved is the preformed compound,1-acetoxy-2-hydroxy-4-oxo-heneicosa-13, 15 diene. Two possibilities exist for maintaining fungitoxic levels of antifungal compounds in the tissue of ripening fruits: (i). Prevention of catabolism (ii). Induction of synthesis. Previous work has demonstrated that increased fruit susceptibility after fruit harvest occurs through diene catabolism mediated by oxidation of the antifungal compound by the enzyme lipoxygenase. Levels of a non-specific inhibitor, epicatechin, in turn, regulate activity of lipoxygenase, present in the peel of unripe but not ripe fruit. In this proposal, we examined the possibility of exploiting induced synthesis of the antifungal compound for the study of the synthetic pathway. The general objective of the present research was to study the mechanism of biosynthesis of natural antifungal compounds in order to regulate the process of resistance to postharvest diseases in ripening avocado fruits. The specific objectives of the research were: 1. To localize synthesis of the antifungal diene and modulate the process by biotic or a biotic elicitors. 2. To determine the relation between synthesis of the diene and accumulation in the peel and fruit resistance to decay 3. To characterize the biosynthetic pathway and the diene and the genes involved. The analysis of the antifungal compounds in avocado resulted in the detection of a new antifungal compound (E, Z, Z)-1-acetoxy-2-hydroxy-4-oxo- heneicosa-5, 12,15-triene. This new compound was shown to inhibit spore germination of C. gloeosporioides similarly as the antifungal diene. We had localized one of the biosynthetic places of these antifungal compounds in specialized idioblast cells (oil cells) in the mesocarp that can be easily enhanced by elicitors as ethylene. Results have also suggested that the antifungal compounds can be "exported" from the mesocarp to the pericarp where its main activity takes place. The search for the biosynthesis of antifungal compounds and the genes involved took two directions i. direct search for specific genes involved in the synthesis of the diene and ii. Indirect selection of genes using the differential display library. We have cloned D9 and D12 desaturase, a protein kinase and a elongase that their transcriptional activation is significantly enhanced during the enhanced synthesis of the antifungal diene. Although we are far away from a complete elucidation of the synthesis of the antifungal compound we have stepped forward determining some of the key steps that might be involved in its synthesis.
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Droby, S., J. L. Norelli, M. E. Wisniewski, S. Freilich, A. Faigenboim und C. Dardick. Microbial networks on harvested apples and the design of antagonistic consortia to control postharvest pathogens. Israel: United States-Israel Binational Agricultural Research and Development Fund, 2020. http://dx.doi.org/10.32747/2020.8134164.bard.
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We have demonstrated, at a global level, the existence of spatial variation in the fungal and bacterial composition of different fruit tissues. The composition, diversity and abundance varied in fruit harvested in different geographical locations and suggests a potential link between location and the type and rate of postharvest diseases that develop in each country. The global core microbiome of apple fruit was determined and found to be represented by several beneficial microbial taxa and accounted for a large fraction of the fruit microbial community. To further characterize apple fruit the microbiome after harvest, a detailed study was performed to evaluate effects of postharvest practices on the composition of the fruit peel. Microbiota. Results of this work conformed our findings that tissue-type is the main factor driving fungal and bacterial diversity and community composition on apple fruit. Both postharvest treatments and low temperature storage had a great impact on the fungal and bacterial diversity and community composition of these tissue types. Distinct spatial and temporal changes in the composition and diversity of the microbiota were observed in response to various postharvest management practices. Our results clearly indicated that apple fruit has a unique core microbiome that is universal. Analysis of the microbiome across Malus species indicates that the microbiome of domesticated apple has a higher diversity and abundance and is an admixture of the microbiome present in its wild progenitors, with clear evidence for introgression. These findings support the existence of co-evolution between Malus species and their microbiome during domestication. A network analysis of the metagenomics data was used to further elucidate functional differences between the microbiome of organic vs. conventional fruit. Our analysis predicted a link between Capnodiales and the degradation of aromatic compounds. Alternaria, a genus in the Capnodiales genus, is one of the main pathogens of stored apple fruit and was also abundant in our samples. The potential role of Alternaria in the degradation of aromatic compounds is in agreement with previous studies indicating a link between Alternaria and the metabolism of the aromatic compound, alphafarnesene38, a key volatile secreted by the fruit during maturation. A greater number of metabolic pathways related to plant defense substances (e.g. terpenoids and alkaloids) were identified in the microbiome of organic fruit samples, while more antibiotic-related metabolic pathways for compounds such as Erythromycin, Avermectin, Ansamycin, and Penicillin were present in the microbiome of apple fruit samples grown using conventional management practices.
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Kleman, Isabella. Onion storage diseases and their headspace volatiles. Faculty of Landscape Architecture, Horticulture and Crop Production Science, Swedish University of Agricultural Sciences, 2023. http://dx.doi.org/10.54612/a.602791tdo5.
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Onion, Allium cepa, is one of the world’s most commonly produced and consumed vegetables. In order to be available year round in temperate climates onions must be stored for several months. During this time parts of the harvested weight of bulbs are lost to storage diseases, sprouting and respiration leading to loss of carbohydrates and water. Diseases developing in storage may be difficult to spot at early stages as bulbs are typically stored in large bins. However, storage diseases can change the volatile metabolite profile of the infected onions. Electronic sensors that detect the concentration of specific volatile compounds in the air could be deployed in storage facilities to detect these changes. This would provide an early warning system that could detect diseases developing in storage bins before it becomes obvious to a human observer. In this way, some of the losses that occur during storage of onions could be prevented. This introductory paper discusses some of the available literature on the facets of onion production that are connected to storage disease development and the detection of said storage diseases using headspace sampling and analysis. The focus of the paper is mainly on onion production and storage of long day cultivars in relatively cold, temperate climates, as the use of short day cultivars and warm storage in warmer climates comes with different challenges and diseases.
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Yamano, Takashi, Noriko Sato und Babur Wasim Arif. The Impact of COVID-19 and Locust Invasion on Farm Households in Punjab and Sindh: Analysis from Cross-Sectional Surveys in Pakistan. Asian Development Bank, Juli 2021. http://dx.doi.org/10.22617/wps210259-2.
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This paper presents the results of two mobile phone surveys conducted by the Asian Development Bank among farmers in Punjab and Sindh provinces in Pakistan in mid-2020 during the coronavirus disease (COVID-19) pandemic. The surveys collected information about how COVID-19-related measures and economic and transport disruptions affected farmers’ harvests, marketing efforts, input prices, and financial needs. The surveys found that the COVID-19 pandemic had significant negative impacts on farm households in both provinces. The paper provides additional context on COVID-19-related effects on local and regional economies and food supply chains. It also covers a simultaneous locust invasion along the India–Pakistan border, which has created “crisis within a crisis” in the surveyed provinces and exacerbated conditions that could lead to famine, disease, and increased poverty.
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Peitz, David. White-tailed deer monitoring at Wilson’s Creek National Battlefield, Missouri: 2005–2022 trend report. Herausgegeben von Tani Hubbard. National Park Service, November 2022. http://dx.doi.org/10.36967/2295163.
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The Heartland Inventory and Monitoring Network has monitored white-tailed deer over an 18-year period (2005–2022) within a defined survey area of Wilson’s Creek National Battlefield, documenting both a rapid decline and recovery in the population. The rapid die-off was the result of a region-wide hemorrhagic disease outbreak reported by the Missouri Department of Conservation that started in the fall of 2005, six months after we initiated deer monitoring. Although declines occurred 2005 to 2007, 2016 to 2017, and 2019 to 2022, the deer population still increased on average by 7.2% annually. The number of deer in the survey area ranged from a low of 14.9 ± 10.1 (mean ± 95% CI) individuals/km2 in 2007 to a high of 167.2 ± 57.4 individuals/km2 in 2016. The visible area surveyed each year varied between 0.7 and 1.1 km2 (coefficient of variation = 14.1%). Annual deer harvest data in the area nearby Wilson’s Creek National Battlefield exhibit similar trends to our annual adjusted counts suggesting that factors other than hunting maybe driving annual changes in deer population size in most years. However, these trends were not significantly correlated (r = 0.34, p = 0.33), so this relationship is only speculative. Overall, the increasing number of deer pose several problems for Wilson’s Creek National Battlefield. First, increasing deer populations add a level of complexity to implementing Wilson’s Creek National Battlefield Cultural Landscape Report recommendations. Deer preferentially browse native vegetation over exotic vegetation, promoting the spread of exotic species, and the success of tree plantings can be curtailed by heavy deer browsing. Second, controlling deer-related disease, some of which can affect domestic livestock and human health in and around the park, becomes increasingly harder as the deer population increases. Third, as additional ancillary data suggests, the largely unreported and costly deer-vehicle collisions in and around Wilson’s Creek National Battlefield have the potential to increase when there are more deer.
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Grumet, R., J. Burger, Y. Tadmor, A. Gur, C. Barry, A. Schäffer und M. Petreikov. Cucumis fruit surface biology: Genetic analysis of fruit exocarp features in melon (C. melo) and cucumber (C. sativus). Israel: United States-Israel Binational Agricultural Research and Development Fund, 2020. http://dx.doi.org/10.32747/2020.8134155.bard.
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The fruit surface (exocarp) is a unique tissue with multiple roles influencing fruit growth and development, disease susceptibility, crop yield, post-harvest treatments, shipping and storage quality, and food safety. Furthermore, highly visible exocarp traits are the consumer's first exposure to the fruit, serving to identify fruit type, variety, attractiveness, and market value. Cucurbit fruit, including the closely related Cucumis species, melon (C. melo) and cucumber (C. sativus), exhibit tremendous diversity for fruit surface properties that are not present in model species. In this project, we identified genetic factors influencing Cucumis fruit surface morphology with respect to important quality determinants such as exocarp and flesh color, cuticle deposition, and surface netting. We employed a combination of approaches including: genome-wide association studies (GWAS) utilizing an extensive melon population and the U.S. Plant Introduction (PI) collection for cucumber to identify genomic regions associated with natural variation in fruit surface traits; bulked segregant RNA-seq (BSR-seq) analysis of bi-parental F2:3 or RIL (recombinant inbred line) populations to genomic regions and candidate genes segregating for fruit surface traits; and comparison of syntenic genomic regions and identification of homologous candidate genes. Candidate genes were examined for sequence and/or expression differences during fruit development that correspond with phenotypic differences. Primary outcomes of the work included identification of candidate genes influencing cuticle deposition, epidermal cell structure, surface netting, and intensity of rind and flesh color. Parallel studies identified mutations within the cucumber and melon homologs of the transcription factor WIN1 (WAX INDUCER1) as a significant factor influencing these surface properties. Additional QTL (quantitative trait loci) were identified in both species, and candidate genes in melon include a novel beta-glucosidase involved in lignin production and an integral membrane protein potentially involved in cuticle metabolism. Genetic resources and biochemical approaches have been developed to study cuticle and wax deposition in both species: segregating populations of melon were developed and sequenced for bulked segregant analysis and samples collected for metabolic analysis; an isolation procedure was developed for lipid droplets from cucumber peel and metabolomic analyses have been initiated. Genetic studies in melon identified mutations in a candidate gene (APRR2), associated with light immature rind, and further indicated that this gene is also associated with color intensity of both mature rinds and flesh, making it a good target for breeding. GWAS studies utilizing the cucumber core diversity population are being performed to identify additional sources of variation for fruit surface properties, map QTL, and examine for synteny with melon. Collectively these studies identified genetic regions associated with important quality traits and contributed to our understanding of underlying biological processes associated with fruit surface development. Knowledge of genetic control of these characteristics can facilitate more efficient breeding for important fruit surface traits.
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Prusky, Dov, Noel T. Keen und Stanley Freeman. Elicitation of Preformed Antifungal Compounds by Non-Pathogenic Fungus Mutants and their Use for the Prevention of Postharvest Decay in Avocado Fruits. United States Department of Agriculture, Januar 1996. http://dx.doi.org/10.32747/1996.7570573.bard.
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C. gloeosporioides attacks unripe avocado fruits in the orchard. Germinated spores produce appressoria that germinate and breach the cuticle, but the resultant subcuticular hyphae become quiescent and do not develop further until fruit is harvested and ripens. Resistance of unripe avocado to attach by C. gloeosporioides is correlated with the presence of fungitoxic concentrations of the preformed antifungal compound, 1-acetoxy-2-hydroxy-4-oxoheneicosa-12, 15 diene in the pericarp of unripe fruits. The objective of this proposal was to study the signal transduction process by which elicitors induce resistance in avocado. It was found that abiotic elicitors, infection of avocado fruit with C. gloeosporioides or treatment of avocado cell suspension with cell-wall elicitor induced a significant production of reactive oxygen species (ROS). Ripe and unripe fruit tissue differ with regard to the ROS production. The unripe, resistant fruit are physiologically able to react and to produce high levels of ROS and increased activity of H+ATPase that can enhance the phenylpropanoid pathway ad regulate the levels of the antifungal compound-diene, inhibit fungal development, resulting in its quiescence. Interestingly, it was also found that growth regulators like cytokinin could do activation of the mechanism of resistance. Postharvest treatments of cytokinins strongly activated the phenylpropanoid pathway and induce resistance. We have developed non-pathogenic strains of C. gloeosporioides by Random Enzyme Mediated Integration and selected a hygromycin resistance, non-pathogenic strain Cg-142 out of 3500 transformants. This non-pathogenic isolate activates H+ATPase and induces resistance against Colletotrichum attack. As a basis for studying the importance of PL in pathogenicity, we have carried out heterologous expression of pel from C. gloeosporioides in the non-pathogenic C. magna and determine the significant increase in pathogenicity of the non-pathogenic strain. Based on these results we can state that pectate lyase is an important pathogenicity factor of C. gloeosporioides and found that fungal pathogenicity is affected not by pel but by PL secretion. Our results suggest that PH regulates the secretion of pectate lyase, and support its importance as a pathogenicity factor during the attack of avocado fruit by C. gloeosporioides . This implicates that if these findings are of universal importance in fungi, control of disease development could be done by regulation of secretion of pathogenicity factors.
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Heitman, Joshua L., Alon Ben-Gal, Thomas J. Sauer, Nurit Agam und John Havlin. Separating Components of Evapotranspiration to Improve Efficiency in Vineyard Water Management. United States Department of Agriculture, März 2014. http://dx.doi.org/10.32747/2014.7594386.bard.
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Vineyards are found on six of seven continents, producing a crop of high economic value with much historic and cultural significance. Because of the wide range of conditions under which grapes are grown, management approaches are highly varied and must be adapted to local climatic constraints. Research has been conducted in the traditionally prominent grape growing regions of Europe, Australia, and the western USA, but far less information is available to guide production under more extreme growing conditions. The overarching goal of this project was to improve understanding of vineyard water management related to the critical inter-row zone. Experiments were conducted in moist temperate (North Carolina, USA) and arid (Negev, Israel) regions in order to address inter-row water use under high and low water availability conditions. Specific objectives were to: i) calibrate and verify a modeling technique to identify components of evapotranspiration (ET) in temperate and semiarid vineyard systems, ii) evaluate and refine strategies for excess water removal in vineyards for moist temperate regions of the Southeastern USA, and iii) evaluate and refine strategies for water conservation in vineyards for semi-arid regions of Israel. Several new measurement and modeling techniques were adapted and assessed in order to partition ET between favorable transpiration by the grapes and potentially detrimental water use within the vineyard inter-row. A micro Bowen ratio measurement system was developed to quantify ET from inter-rows. The approach was successful at the NC site, providing strong correlation with standard measurement approaches and adding capability for continuous, non-destructive measurement within a relatively small footprint. The environmental conditions in the Negev site were found to limit the applicability of the technique. Technical issues are yet to be solved to make this technique sufficiently robust. The HYDRUS 2D/3D modeling package was also adapted using data obtained in a series of intense field campaigns at the Negev site. The adapted model was able to account for spatial variation in surface boundary conditions, created by diurnal canopy shading, in order to accurately calculate the contribution of interrow evaporation (E) as a component of system ET. Experiments evaluated common practices in the southeastern USA: inter-row cover crops purported to reduce water availability and thereby favorably reduce grapevine vegetative growth; and southern Israel: drip irrigation applied to produce a high value crop with maximum water use efficiency. Results from the NC site indicated that water use by the cover crop contributed a significant portion of vineyard ET (up to 93% in May), but that with ample rainfall typical to the region, cover crop water use did little to limit water availability for the grape vines. A potential consequence, however, was elevated below canopy humidity owing to the increased inter-row evapotranspiration associated with the cover crops. This creates increased potential for fungal disease occurrence, which is a common problem in the region. Analysis from the Negev site reveals that, on average, E accounts for about10% of the total vineyard ET in an isolated dripirrigated vineyard. The proportion of ET contributed by E increased from May until just before harvest in July, which could be explained primarily by changes in weather conditions. While non-productive water loss as E is relatively small, experiments indicate that further improvements in irrigation efficiency may be possible by considering diurnal shading effects on below canopy potential ET. Overall, research provided both scientific and practical outcomes including new measurement and modeling techniques, and new insights for humid and arid vineyard systems. Research techniques developed through the project will be useful for other agricultural systems, and the successful synergistic cooperation amongst the research team offers opportunity for future collaboration.