Vineyard evaluation of stilbenoid‐rich grape cane extracts against downy mildew: a large‐scale study
2019
Billet, Kevin | Delanoue, Guillaume | Arnault, Ingrid | Besseau, Sébastien | Oudin, Audrey | Courdavault, Vincent | Marchand, Patrice | Giglioli‐guivarc'H, Nathalie | Guérin, Laurence | Lanoue, Arnaud | Biomolécules et biotechnologies végétales (BBV) ; Université de Tours (UT) | Unité de recherche sur les Biopolymères, Interactions Assemblages (BIA) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Val de Loire Centre, Vinopôle Centre Val de Loire ; Institut Français de la Vigne et du Vin [Siège] (IFV) | Institut Français de la Vigne et du Vin [Siège] (IFV) | Institut de recherche sur la biologie de l'insecte (IRBI) ; Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS) | Institut Technique de l'Agriculture Biologique (ITAB) | Pôle Val de Loire ; Institut Français de la Vigne et du Vin [Siège] (IFV) | Region Centre-Val de Loire ; Interloire.
International audience
Show more [+] Less [-]English. Plasmopara viticola control in organic viticulture requires copper-based fungicides with harmful effects on health and the environment. Plant extracts represent a biorational eco-friendly alternative to copper. The aim of this study was to evaluate the potential of stilbenoid-rich grape cane extract (GCE) against downy mildew on three cultivars over 3 years following natural downy mildew infection.RESULTS:Over all field trials, GCE treatments showed an average reduction in disease incidence of -35% and -38% on leaves and clusters, respectively. The average reduction in disease severity was -35% and -43% on leaves and clusters, respectively. Under artificial downy mildew infection, GCE efficacy corresponded to 1 g L-1 of copper. Neither phytotoxicity nor adverse effects on auxiliary fauna were observed after treatment with GCE.CONCLUSION:Because few or no biocontrol agents are active alone against P. viticola, GCE is a promising alternative to copper-based fungicides. Grape canes, an abundant by-product of viticulture, have great potential for valorization as a biocontrol agent for sustainable viticulture.
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