Articles de revues sur le sujet « Sustainable viticulture, Fungal diseases, Grapevine protection »
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1
Blundell, Robert, Molly Arreguin et Akif Eskalen. « In vitro evaluation of grapevine endophytes, epiphytes and sap micro-organisms for potential use to control grapevine trunk disease pathogens ». Phytopathologia Mediterranea 60, no 3 (30 décembre 2021) : 535–48. http://dx.doi.org/10.36253/phyto-12500.
Texte intégralRésumé :
Grapevine trunk diseases (GTDs) threaten the economic sustainability of viticulture, causing reductions of yield and quality of grapes. Biological control is a promising sustainable alternative to cultural and chemical methods to mitigate the effects of pathogens causing GTDs, including Botryosphaeria dieback, Eutypa dieback and Esca. This study aimed to identify naturally occurring potential biological control agents from grapevine sap, cane and pith tissues, and evaluate their in vitro antagonistic activity against selected fungal GTD pathogens. Bacterial and fungal isolates were preliminarily screened in dual culture assays to determine their antifungal activity against Neofusicoccum parvum and Eutypa lata. Among the fungal isolates, Trichoderma spp. inhibited mycelium growth of E. lata by up to 64% and of N. parvum by up to 73%, with overgrowth and growth cessation being the likely antagonistic mechanisms. Among the bacterial isolates, Bacillus spp. inhibited mycelium growth of E. lata by up to 20% and of N. parvum by up to 40%. Selected antagonistic isolates of Trichoderma, Bacillus and Aureobasidium spp. were subjected to further dual culture antifungal analyses against Diplodia seriata and Diaporthe ampelina, with Trichoderma isolates consistently causing the greatest inhibition. Volatile organic compound antifungal analyses showed that these Trichoderma isolates inhibited mycelium growth of N. parvum (20% inhibition), E. lata (61% inhibition) and Dia. ampelina (71% inhibition). Multilocus sequence analyses revealed that the Trichoderma isolates were most closely related to Trichoderma asperellum and Trichoderma hamatum. This study had identified grapevine sap as a novel source of potential biological control agents for control of GTDs. Further testing will be necessary to fully characterize modes of antagonism of these microorganisms, and assess their efficacy for pruning wound protection in planta.
2
Monteiro, Eliana, Berta Gonçalves, Isabel Cortez et Isaura Castro. « The Role of Biostimulants as Alleviators of Biotic and Abiotic Stresses in Grapevine : A Review ». Plants 11, no 3 (31 janvier 2022) : 396. http://dx.doi.org/10.3390/plants11030396.
Texte intégralRésumé :
The viticulture and wine industry contribute to the economy and reputation of many countries all over the world. With the predicted climate change, a negative impact on grapevine physiology, growth, production, and quality of berries is expected. On the other hand, the impact of these changes in phytopathogenic fungi development, survival rates, and host susceptibility is unpredictable. Grapevine fungal diseases control has been a great challenge to winegrowers worldwide. The use of chemicals in viticulture is high, which can result in the development of pathogen resistance, increasingly raising concerns regarding residues in wine and effects on human and environmental health. Promoting sustainable patterns of production is one of the overarching objectives and essential requirements for sustainable development. Alternative holistic approaches, such as those making use of biostimulants, are emerging in order to reduce the consequences of biotic and abiotic stresses in the grapevine, namely preventing grape fungal diseases, improving grapevine resistance to water stress, and increasing yield and berry quality.
3
Kenfaoui, Jihane, Nabil Radouane, Mohammed Mennani, Abdessalem Tahiri, Lahsen El Ghadraoui, Zineb Belabess, Florence Fontaine et al. « A Panoramic View on Grapevine Trunk Diseases Threats : Case of Eutypa Dieback, Botryosphaeria Dieback, and Esca Disease ». Journal of Fungi 8, no 6 (1 juin 2022) : 595. http://dx.doi.org/10.3390/jof8060595.
Texte intégralRésumé :
Grapevine trunk diseases (GTD) are currently one of the most devastating and challenging diseases in viticulture, leading to considerable yield losses and a remarkable decline in grapevine quality. The identification of the causal agents is the cornerstone of an efficient approach to fighting against fungal diseases in a sustainable, non-chemical manner. This review attempts to describe and expose the symptoms of each pathology related to GTD, the modes of transmission, and the harmfulness of recently reported agents. Special attention was given to new diagnostic tests and technologies, grapevine defense mechanisms, molecular mechanisms of endophytes fungal colonization, and management strategies used to control these threats. The present extended review is, therefore, an updated state-of-the-art report on the progress in the management of vineyards.
4
Schabl, Paul, Christoph Gabler, Erhard Kührer et Walter Wenzel. « Effects of silicon amendments on grapevine, soil and wine ». Plant, Soil and Environment 66, No. 8 (31 août 2020) : 403–14. http://dx.doi.org/10.17221/40/2020-pse.
Texte intégralRésumé :
Replacing Bordeaux broth and synthetic fungicides by less invasive approaches of fungal disease control remains a challenge for both conventional and organic viticulture. Silicon (Si) application has been proposed as a viable alternative for the control of pathogens and other stresses in agriculture. In a three-year field trial, we tested the effect of foliar and soil application of colloidal silicon on its availability in vineyard soil and pants, the performance and quality of yield, and finally, the control of powdery mildew for grapevine cv. Grüner Veltliner. Soil application of colloidal silicon increased plant-available Si, but only foliar application increased the total silicon concentrations in leaves, yield, and cluster weight. Moreover, the wine produced from the silica-treated grapes were ranked better in sensory evaluations. Our findings provide evidence for the potential of at least partially replacing conventional fungicides, rendering viticulture more sustainable in terms of soil protection and biodiversity. Silicon applications are low in costs and comply with the principles of organic wine production.
5
Blundell, Robert, et Akif Eskalen. « Biological and chemical pruning wound protectants reduce infection of grapevine trunk disease pathogens ». California Agriculture 75, no 3 (janvier 2022) : 128–34. http://dx.doi.org/10.3733/ca.2021a0018.
Texte intégralRésumé :
Grapevine trunk diseases (GTDs) are currently considered some of the most important challenges for viticulture, curtailing vineyard longevity and productivity in nearly every raisin, table and wine grape production region in California and worldwide. Pruning wounds provide the main entry point for fungal pathogens responsible for these diseases; pathogens enter the wounds following precipitation events. The aim of this study was to evaluate the efficacy of selected chemical and experimental biological fungicides for protection of pruning wounds against two of the most common and virulent fungal pathogens causing GTDs: Eutypa lata and Neofusicoccum parvum. This study was conducted on sauvignon blanc at the UC Davis Department of Plant Pathology Field Station. Results showed that several chemical and biological fungicides, notably the chemical fungicide Luna Sensation, the biofungicide Vintec and a combination of the biofungicides Bio-Tam and CrabLife Powder, provided significant protection against at least one of the two canker pathogens used in this study. However, the majority of products tested did not provide simultaneous control of both E. lata and N. parvum pathogens, highlighting the continuing challenge of controlling GTDs.
6
Viret, O., J. L. Spring, V. Zufferey, K. Gindro, C. Linder, A. Gaume et F. Murisier. « Past and future of sustainable viticulture in Switzerland ». BIO Web of Conferences 15 (2019) : 01013. http://dx.doi.org/10.1051/bioconf/20191501013.
Texte intégralRésumé :
Switzerland is a pioneer country in the development of integrated production (IP) and integrated pest management (IPM). The overall goal is sustainability at the ecological, economic and social level to produce high quality grapes. In 1993, the IP-IPM head-organisation VITISWISS was created. The starting points were the improvement of pest management by the biocontrol of spider mites and the control of grape berry moths by mating disruption and an optimal soil management, followed over the years by state-of-the-art sprayer calibration, development of disease forecasting models (AgroMeteo, VitiMeteo), leaf-area adapted dosage of plant protection products, enhanced biodiversity, water and cover crop management. The efforts and the results gained in a continuous education process by the growers are considerable, but not enough for consumers and politics concerned by the use of plant protection products. The absence of acaricides and insecticides as well as forecasting systems available on the internet (www.agrometeo.ch) for the control of downy and powdery mildew, represent the major progresses. Where mechanisation is possible, herbicides can progressively be replaced by mechanical technics, which is not possible in steep vineyards. The general irrational unscientific trend against “synthetic” plant protection products requests alternatives for the control of fungal diseases and for cover crop management under the vine rows to avoid excessive water-nitrogen competition particularly in the actual context of climate change.
7
Gramaje, David, Aleš Eichmeier, Milan Spetik, María Julia Carbone, Rebeca Bujanda, Jessica Vallance et Patrice Rey. « Exploring the Temporal Dynamics of the Fungal Microbiome in Rootstocks, the Lesser-Known Half of the Grapevine Crop ». Journal of Fungi 8, no 5 (20 avril 2022) : 421. http://dx.doi.org/10.3390/jof8050421.
Texte intégralRésumé :
Rootstocks are the link between the soil and scion in grapevines, can provide tolerance to abiotic and biotic stresses, and regulate yield and grape quality. The vascular system of grapevine rootstocks in nurseries is still an underexplored niche for research, despite its potential for hosting beneficial and pathogenic microorganisms. The purpose of this study was to investigate the changes in the composition of fungal communities in 110 Richter and 41 Berlandieri rootstocks at four stages of the grapevine propagation process. Taxonomic analysis revealed that the fungal community predominantly consisted of phylum Ascomycota in all stages of the propagation process. The alpha-diversity of fungal communities differed among sampling times for both rootstocks, with richness and fungal diversity in the vascular system decreasing through the propagation process. The core microbiome was composed of the genera Cadophora, Cladosporium, Penicillium and Alternaria in both rootstocks, while the pathogenic genus Neofusicoccum was identified as a persistent taxon throughout the propagation process. FUNguild analysis showed that the relative abundance of plant pathogens associated with trunk diseases increased towards the last stage in nurseries. Fungal communities in the vascular system of grapevine rootstocks differed between the different stages of the propagation process in nurseries. Numerous genera associated with potential biocontrol activity and grapevine trunk diseases were identified. Understanding the large diversity of fungi in the rootstock vascular tissue and the interactions between fungal microbiota and grapevine will help to develop sustainable strategies for grapevine protection.
8
Maddalena, Giuliana, Elena Marone Fassolo, Piero Attilio Bianco et Silvia Laura Toffolatti. « Disease Forecasting for the Rational Management of Grapevine Mildews in the Chianti Bio-District (Tuscany) ». Plants 12, no 2 (7 janvier 2023) : 285. http://dx.doi.org/10.3390/plants12020285.
Texte intégralRésumé :
Downy and powdery mildews are major grapevine diseases. In organic viticulture, a few fungicides with protectant activities (copper and sulphur in particular) can be used, and their preventative application frequently leads to unneeded spraying. The adoption of an epidemiological disease forecasting model could optimise the timing of treatments and achieve a good level of disease protection. In this study, the effectiveness of the EPI (Etat Potentiel d’Infection) model in predicting infection risk for downy and powdery mildews was evaluated in nine organic vineyards located in Panzano in Chianti (FI), over a 2-year period (2020–2021). The reliability of the EPI model was investigated by comparing the disease intensities, the number of fungicide sprayings, the quantities of the fungicides (kg/ha), and the costs of the treatment achieved, with or without the use of the model, in a vineyard. The results obtained over two seasons indicated that, in most cases, the use of the EPI model accurately signalled the infection risk and allowed for a reduction in the frequency and cost of spraying, particularly for powdery mildew control (−40% sprayings, −20% costs compared to the farmer’s schedule), without compromising crop protection. The use of the EPI model can, therefore, contribute to more-sustainable disease management in organic viticulture.
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Calderone, Francesca, Alessandro Vitale, Salvina Panebianco, Monia Federica Lombardo et Gabriella Cirvilleri. « COS-OGA Applications in Organic Vineyard Manage Major Airborne Diseases and Maintain Postharvest Quality of Wine Grapes ». Plants 11, no 13 (1 juillet 2022) : 1763. http://dx.doi.org/10.3390/plants11131763.
Texte intégralRésumé :
In most wine-growing countries of the world the interest for organic viticulture and eco-friendly grape production processes increased significantly in the last decade. Organic viticulture is currently dependent on the availability of Cu and S compounds, but their massive use over time has led to negative effects on environment health. Consequently, the purpose of this study was to evaluate the effectiveness of alternative and sustainable treatments against powdery mildew, gray mold and sour rot under the field conditions on Nero d’Avola and Inzolia Sicilian cultivars. In detail, the efficacy of COS-OGA, composed by a complex of oligochitosans and oligopectates, and its effects in combination with arbuscular mycorrhizal fungi (AMF) were evaluated to reduce airborne disease infections of grape. COS-OGA combined with AMF induced a significant reduction in powdery mildew severity both on Nero d’Avola and Inzolia with a mean percentage decrease of about 15% and 33%, respectively. Moreover, COS-OGA alone and combined with AMF gave a good protection against gray mold and sour rot with results similar to the Cu–S complex (performance in disease reduction ranging from 65 to 100%) on tested cultivars. Similarly, the COS-OGA and AMF integration provided good performances in enhancing average yield and did not negatively impact quality and microbial communities of wine grape. Overall, COS-OGA alone and in combination could be proposed as a valid and safer option for the sustainable management of the main grapevine pathogens in organic agroecosystems.
10
Bustamante, Marcelo I., Karina Elfar et Akif Eskalen. « Evaluation of the Antifungal Activity of Endophytic and Rhizospheric Bacteria against Grapevine Trunk Pathogens ». Microorganisms 10, no 10 (14 octobre 2022) : 2035. http://dx.doi.org/10.3390/microorganisms10102035.
Texte intégralRésumé :
Grapevine trunk diseases (GTDs) are caused by multiple unrelated fungal pathogens, and their management remains difficult worldwide. Biocontrol is an attractive and sustainable strategy given the current need for a cleaner viticulture. In this study, twenty commercial vineyards were sampled across California to isolate endophytic and rhizospheric bacteria from different grapevine cultivars with the presence and absence of GTD symptoms. A collection of 1344 bacterial isolates were challenged in vitro against Neofusicoccum parvum and Diplodia seriata, from which a subset of 172 isolates exerted inhibition levels of mycelial growth over 40%. Bacterial isolates were identified as Bacillus velezensis (n = 154), Pseudomonas spp. (n = 12), Serratia plymuthica (n = 2) and others that were later excluded (n = 4). Representative isolates of B. velezensis, P. chlororaphis, and S. plymuthica were challenged against six other fungal pathogens responsible for GTDs. Mycelial inhibition levels were consistent across bacterial species, being slightly higher against slow-growing fungi than against Botryosphaeriaceae. Moreover, agar-diffusible metabolites of B. velezensis strongly inhibited the growth of N. parvum and Eutypa lata, at 1, 15, and 30% v/v. The agar-diffusible metabolites of P. chlororaphis and S. plymuthica, however, caused lower inhibition levels against both pathogens, but their volatile organic compounds showed antifungal activity against both pathogens. These results suggest that B. velezensis, P. chlororaphis and S. plymuthica constitute potential biocontrol agents (BCAs) against GTDs and their application in field conditions should be further evaluated.
11
Llamazares De Miguel, Diego, Amaia Mena-Petite et Ana María Díez-Navajas. « Toxicity and Preventive Activity of Chitosan, Equisetum arvense, Lecithin and Salix Cortex against Plasmopara viticola, the Causal Agent of Downy Mildew in Grapevine ». Agronomy 12, no 12 (10 décembre 2022) : 3139. http://dx.doi.org/10.3390/agronomy12123139.
Texte intégralRésumé :
Grapevine, a crop of global economic importance, is annually affected by diseases that can compromise the quality and quantity of the harvest, producing large economic losses. Downy mildew caused by Plasmopara viticola (Berk. & M.A. Curtis) Berl. & de Toni is one of the most important diseases in the vineyard. To fight this pathogen, winegrowers often rely on conventional chemical fungicides or copper-based formulations, whose use is determined to be reduced by the European Commission due to their environmental consequences. Hence, alternative plant protection products (PPP) in grapevine must be considered and studied. In this context, we selected several alternative commercial products, based on basic substances (BS) or low-risk active substances (LRAS), to evaluate their suitability to deal with P. viticola. We measured the preventive activity of the products, both in vitro and in planta, as well as their toxicity against the sporangia and zoospores of the pathogen. Results showed that four commercial products were effective against the pathogen directly and preventively, being composed of approved basic substances, more concretely, chitosan, Equisetum arvense, lecithins, and Salix cortex. Among those, the products composed of lecithins and Salix cortex were the most toxic and active preventively. Therefore, these basic substances should be promoted in the vineyard as an alternative to conventional treatments in order to transition to a more sustainable viticulture.
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Aleinikova, N. V., Y. E. Radionovskaia, Y. S. Galkina, V. V. Andreyev, L. V. Didenko, S. Y. Belash, P. A. Didenko, V. N. Shaporenko et E. A. Bolotianskaia. « Information databases - the basis for the formation of the adaptive pest control systems in the ampelocenoses of the Crimea ». Plant Biology and Horticulture : theory, innovation 1, no 157 (11 janvier 2021) : 18–25. http://dx.doi.org/10.36305/2712-7788-2020-4-157-18-25.
Texte intégralRésumé :
Currently plant protection undergoes a period of active digitalization, which effects the most diverse aspects of its activity and involves the formation of phytosanitary databases, electronic detectors, the use of digital intelligence (creation and training of neural networks), software development, the use of unmanned aerial vehicles, automatic agrometeorological stations, etc., and in general, the creation of decision -making support systems. The development of information databases is the first and very important stage in the creation of a decision-making system, which allows tracking long-term and seasonal changes in the structure of biota of agrocenoses with the necessary reliability, predicting phytosanitary risks, developing adaptive systems of protection, as well as promptly and reasonably making adjustments to them. In 2015-2019 on fruit-bearing industrial plantations of primary viticultural zones of the Crimea – the Southern Coast, Mountain-Valley, South-West and Central Steppe zones, the study of structures of entomo-, acaro- and pathocomplexes of grapes was carried out. Vineyards of wine and table cultivars typical for each region were selected for observations. The development of more than 20 fungal and bacterial diseases, affecting the above-ground and underground organs of grape plants was confirmed. We obtained new data on zonal features of formation and changing of pathocomplexes of Crimean ampelocenoses, their structure, different pathogen frequency index values and the intensity of damage to the vegetative and generative organs of grape plants. Thus, we accumulated the material for the formation of information database on the structure of zonal pathocomplexes of Crimean ampelocenoses. Basing on the results of study of the structure of zonal complexes of arthropod pests of grapevine, the information database "The structure of entomoacarocomplexes of ampelocenosis phytophages of primary zones of the Crimean viticulture" (AAAA-G20-620051990003-5) was developed and contained the annotated list of 55 species of phytophages of grapes. The database includes data on the comparative characteristics of zonal complexes of ampelocenosis phytophages of the Crimea in terms of species abundance, taxonomic and ecological characteristics, as well as the frequency of occurrence of the species studied.
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de la Fuente, M., C. Calvo, R. Roda, J. Ruiz, M. Mazzieri, R. Ferrer et S. de Lamo. « Large-scale implementation of sustainable production practices in the Priorat-Montsant region ». BIO Web of Conferences 15 (2019) : 01014. http://dx.doi.org/10.1051/bioconf/20191501014.
Texte intégralRésumé :
The Priorat and Montsant Appellations of Origin are considered to produce some of the finest wines in the Mediterranean area of Spain. Located in the south of Catalonia (North-East Spain), they account for close to 4000 ha cultivated by more than 1300 vine growers under severe Mediterranean climatic conditions and hence threatened by global warming. In this context, sustainable practices are needed for the optimal use of natural resources in order to ensure the durability of high-quality wine production in the region. In addition, these practices allow this region to maintain high levels of biodiversity, a major characteristic of Priorat and Montsant's agricultural landscape, which represents an important touristic attraction. The Project LIFE Priorant+Montsant, funded by the European Union, proposed the implementation of sustainable practices at a regional scale, in order to achieve remarkable reductions of resource consumption in three axes: 1) Irrigation water management, 2) vine fertilization and 3) synthetic pesticide use. Reductions are achieved by providing the necessary technical support to growers to adopt practices, developing optimized strategies and evaluating the viticulture and winery production processes. After the two first seasons of the project, 2017 and 2018, the objectives of reduction of resources consumption have been successfully achieved. A total of 53 vineyard plots, representing the main grape varieties in the region (Grenache, Carignan, Cabernet Sauvignon and Syrah) were classified in eight sub-areas and monitored for water consumption. From pea-size to harvest (phenological stages), weekly measurements of phenology, water potential and meteorological data were collected. Irrigation recommendations were then given to growers, to avoid water potential below − 1.4 MPa. Overall, more than 50 irrigation recommendations were emitted to growers. The water consumption with the optimized irrigation strategy ranged from 10 to 63 litres per ha, the recommended dose saved 20 to 87% of the irrigation water per year, according to previous general recommendations in this region. Regarding fertilization, soil samples were provided by growers and leave samples were taken from vineyards to assess nutrient levels and develop the corresponding recommendation of fertilization, depending on the analysis results. The analyzed soil samples from the different sub-areas were grouped by the Principal Component Analysis, in which the first and second principal components accounted for 31.6% and 11.8% of the variability and were related to soil texture and nutrient content of soils, respectively. Overall, the recommended doses of organic fertilizers saved more than 20% of the usual chemical fertilizer application in the region. The reduction of pesticide use will be achieved through three actions related to three main pests and diseases of grapevine: optimized formulations against powdery mildew, alternative products to reduce copper use against downy mildew and, increase of surface under mating disruption strategy against grape berry moth Lobesia botrana. Before implementing these actions, no vineyards were managed under mating disruption in the Montsant area and 207 ha have been monitored in 2018 after two years. In the Priorat area, more than 200 ha have also adopted this strategy during the project. This action has saved more than 500 application doses of synthetic insecticides in those vineyards. Within the same scope, several formulations will be proved in the following years in order to assess their effectiveness against powdery and downy mildew in further specific field trials. Candidate products will be introduced in Integrated Pest Management strategies to achieve the desired pesticide reduction levels. The results will represent specific regional strategies for irrigation, fertilization and plant protection, and are extensible to most of the vineyards in Priorat and Montsant, as well as to other vitivinicultural regions which similar conditions. Keywords: Sustainable management, Irrigation, Fertilisation, Pesticides, Priorat-Montsant.
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Zarraonaindia, Iratxe, Enrico Cretazzo, Amaia Mena-Petite, Ana M. Díez-Navajas, Usue Pérez-López, Maite Lacuesta, Eva Pilar Pérez-Álvarez et al. « Holistic understanding of the response of grapevines to foliar application of seaweed extracts ». Frontiers in Plant Science 14 (24 février 2023). http://dx.doi.org/10.3389/fpls.2023.1119854.
Texte intégralRésumé :
Viticulture is highly dependent on phytochemicals to maintain good vineyard health. However, to reduce their accumulation in the environment, green regulations are driving the development of eco-friendly strategies. In this respect, seaweeds have proven to be one of the marine resources with the highest potential as plant protective agents, representing an environmentally-friendly alternative approach for sustainable wine production. The current work follows an interdisciplinary framework to evaluate the capacity of Ulva ohnoi and Rugulopteryx okamurae seaweeds to induce defense mechanisms in grapevine plants. To our knowledge, this is the first study to evaluate Rugulopteryx okamurae as a biostimulator . This macroalgae is relevant since it is an invasive species on the Atlantic and Mediterranean coast causing incalculable economic and environmental burdens. Four extracts (UL1, UL2, RU1 and RU2 developed from Ulva and Rugulopteryx, respectively) were foliar applied to Tempranillo plants cultivated under greenhouse conditions. UL1 and RU2 stood out for their capacity to induce defense genes, such as a PR10, PAL, STS48 and GST1, mainly 24 hours after the first application. The increased expression level of these genes agreed with i) an increase in trans-piceid and trans-resveratrol content, mainly in the RU2 treated leaves, and, ii) an increase in jasmonic acid and decrease in salicylic acid. Moreover, an induction of the activity of the antioxidant enzymes was observed at the end of the experiment, with an increase in superoxide dismutase and catalase in the RU2-treated leaves in particular. Interestingly, while foliar fungal diversity was not influenced by the treatments, alga extract amendment modified fungal composition, RU2 application enriching the content of various groups known for their biocontrol activity. Overall, the results evidenced the capacity of Rugulopteryx okamurae for grapevine biostimulation, inducing the activation of several secondary metabolite pathways and promoting the abundance of beneficial microbiota involved in grapevine protection. While further studies are needed to unravel the bioactive compound(s) involved, including conducting field experiments etc., the current findings are the first steps towards the inclusion of Rugulopteryx okamurae in a circular scheme that would reduce its accumulation on the coast and benefit the viticulture sector at the same time.
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Leal, Catarina, Nicolas Richet, Jean-François Guise, David Gramaje, Josep Armengol, Florence Fontaine et Patricia Trotel-Aziz. « Cultivar Contributes to the Beneficial Effects of Bacillus subtilis PTA-271 and Trichoderma atroviride SC1 to Protect Grapevine Against Neofusicoccum parvum ». Frontiers in Microbiology 12 (14 octobre 2021). http://dx.doi.org/10.3389/fmicb.2021.726132.
Texte intégralRésumé :
Grapevine trunk diseases (GTDs) are a big threat for global viticulture. Without effective chemicals, biocontrol strategies are developed as alternatives to better cope with environmental concerns. A combination of biological control agents (BCAs) could even improve sustainable disease management through complementary ways of protection. In this study, we evaluated the combination of Bacillus subtilis (Bs) PTA-271 and Trichoderma atroviride (Ta) SC1 for the protection of Chardonnay and Tempranillo rootlings against Neofusicoccum parvum Bt67, an aggressive pathogen associated to Botryosphaeria dieback (BD). Indirect benefits offered by each BCA and their combination were then characterized in planta, as well as their direct benefits in vitro. Results provide evidence that (1) the cultivar contributes to the beneficial effects of Bs PTA-271 and Ta SC1 against N. parvum, and that (2) the in vitro BCA mutual antagonism switches to the strongest fungistatic effect toward Np-Bt67 in a three-way confrontation test. We also report for the first time the beneficial potential of a combination of BCA against Np-Bt67 especially in Tempranillo. Our findings highlight a common feature for both cultivars: salicylic acid (SA)-dependent defenses were strongly decreased in plants protected by the BCA, in contrast with symptomatic ones. We thus suggest that (1) the high basal expression of SA-dependent defenses in Tempranillo explains its highest susceptibility to N. parvum, and that (2) the cultivar-specific responses to the beneficial Bs PTA-271 and Ta SC1 remain to be further investigated.
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Leal, Catarina, Nicolas Richet, Jean-François Guise, David Gramaje, Josep Armengol, Florence Fontaine et Patricia Trotel-Aziz. « Cultivar Contributes to the Beneficial Effects of Bacillus subtilis PTA-271 and Trichoderma atroviride SC1 to Protect Grapevine Against Neofusicoccum parvum ». Frontiers in Microbiology 12 (14 octobre 2021). http://dx.doi.org/10.3389/fmicb.2021.726132.
Texte intégralRésumé :
Grapevine trunk diseases (GTDs) are a big threat for global viticulture. Without effective chemicals, biocontrol strategies are developed as alternatives to better cope with environmental concerns. A combination of biological control agents (BCAs) could even improve sustainable disease management through complementary ways of protection. In this study, we evaluated the combination of Bacillus subtilis (Bs) PTA-271 and Trichoderma atroviride (Ta) SC1 for the protection of Chardonnay and Tempranillo rootlings against Neofusicoccum parvum Bt67, an aggressive pathogen associated to Botryosphaeria dieback (BD). Indirect benefits offered by each BCA and their combination were then characterized in planta, as well as their direct benefits in vitro. Results provide evidence that (1) the cultivar contributes to the beneficial effects of Bs PTA-271 and Ta SC1 against N. parvum, and that (2) the in vitro BCA mutual antagonism switches to the strongest fungistatic effect toward Np-Bt67 in a three-way confrontation test. We also report for the first time the beneficial potential of a combination of BCA against Np-Bt67 especially in Tempranillo. Our findings highlight a common feature for both cultivars: salicylic acid (SA)-dependent defenses were strongly decreased in plants protected by the BCA, in contrast with symptomatic ones. We thus suggest that (1) the high basal expression of SA-dependent defenses in Tempranillo explains its highest susceptibility to N. parvum, and that (2) the cultivar-specific responses to the beneficial Bs PTA-271 and Ta SC1 remain to be further investigated.