Pest Management Science (2019) 75, 1252-1257

Kévin Billet, Guillaume Delanoue, Ingrid Arnault, Sébastien Besseau, Audrey Oudin, Vincent Courdavault, Patrice A. Marchand, Nathalie Giglioli-Guivarc, Laurence Guérin and Arnaud Lanoue (2019)
Vineyard evaluation of stilbenoid-rich grape cane extracts against downy mildew: a large-scale study
Pest Management Science 75 (5), 1252-1257
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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Ingrid Arnault

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plasmopara viticola	Grapevine (Vitis)