Pythium oligandrum root colonization of grafted vines and protection against the Grapevine Trunk Disease pathogen, Phaeomoniella chlamydospora

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Pythium oligandrum root colonization of grafted vines and protection against the Grapevine Trunk Disease pathogen, Phaeomoniella chlamydospora

Description

Abstract: Esca is the most destructive Grapevine Trunk Disase (GTD). It causes substantial losses in vineyards, for instance 13% of the French vineyard is unproductive because of Esca. No efficient chemical product is registered to control this disease but a biocontrol strategy is presently developed. Pythium oligandrum, a biological control agent, frequently isolated from the roots of grapevines planted in the Bordeaux region (France), displays interesting properties to control grapevine diseases, including Esca. P. oligandrum root colonization of cv. Cabernet Sauvignon cuttings (not grafted) reduced by half the necroses caused by Phaeomoniella chlamydospora, a pathogen involved in Esca, In order to apply P. oligandrum in nurseries and vineyards that mainly used grafted plants, plant protection induced by the oomycete on grafted plants has to be verified. A greenhouse assay showed that P. oligandrum colonizes rootstock (SO4) roots over the whole experiment period. Moreover, necroses in the trunk and P. chlamydospora DNA quantities in the rootstock were reduced in P. oligandrum inoculated plants.

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