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- Title
Vineyard evaluation of stilbenoid‐rich grape cane extracts against downy mildew: a large‐scale study.
- Authors
Billet, Kévin; Besseau, Sébastien; Oudin, Audrey; Courdavault, Vincent; Giglioli‐Guivarc'h, Nathalie; Lanoue, Arnaud; Delanoue, Guillaume; Guérin, Laurence; Arnault, Ingrid; Marchand, Patrice A
- Abstract
BACKGROUND: 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. © 2018 Society of Chemical Industry Plant extracts represent an eco‐friendly alternative to copper. This study evaluates the potential of stilbenoid‐rich grape cane extract against downy mildew in a large vineyard experiment.
- Subjects
STAFFS (Sticks, canes, etc.); BIOLOGICAL pest control agents; PLASMOPARA viticola; EXPERIMENTAL agriculture; VITIS vinifera; GRAPES
- Publication
Pest Management Science, 2019, Vol 75, Issue 5, p1252
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.5237