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Alternatives to copper-based treatments for the control of grapevine downy mildew (Plasmopara viticola): 5-year synthesis of trials in France and Italy

Parveaud, Claude-Eric; Gomez, Christelle; Chovelon, Marc; Lambion, Jérôme; Dagostin, Silvia and Pertot, Ilaria (2010) Alternatives to copper-based treatments for the control of grapevine downy mildew (Plasmopara viticola): 5-year synthesis of trials in France and Italy. [Alternatives aux traitements à base de cuivre pour la lutte contre le mildiou de la vigne (Plasmopara viticola): Synthèse de 5 années d'expérimentation en France et en Italie.] Poster at: 28th International Horticultural Congress, Lisbon, Portugal, 22-27 August 2010.

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The objective of the UE-funded program REPCO (FP6) was to identify new alternatives to copper fungicides in organic farming. Two pathogens have been considered: grapevine downy mildew (Plasmopara viticola) and apple scab (Venturia inaequalis). Research on grapevine was carried out by GRAB (Avignon, France) and FEM-IASMA (San Michele all’Adige, Italy). Trials were carried out under natural conditions in order to test reduced doses of copper and copper-free alternatives. Five-year trials proved that copper is the best fungicide. However, the use of new low copper rate formulations and the association of copper-free alternatives with reduced doses of copper or with reduced number of copper applications (limited to the most susceptible grapevine growth stages) were able to control of downy mildew with a concomitant reduced impact to the environment. Among the tested products, Trichodex (Trichoderma harzianum T39), Mycosin (clay), Chitoplant (chitosan), Saponin (Yucca extract), and an experimental sage extract (Salvia officinalis) gave the best results. The level of plant protection was similar to copper (standard), but not significantly different from the untreated control. Efficacy was good under low or medium disease pressure, but decreased when the pressure increased. The trials carried out after REPCO project confirmed that blossom stage is the most risky period for downy mildew infection and that a reduction of the number of treatments, with consequent reduction of the yearly total amount of copper, is possible by applying treatments during this period. These results show that more research efforts are needed to substitute copper in organic grape growing, and at present the practical approach must focus on combining strategies (alternative products and reduced copper, understanding the most susceptible stages of the plant, applying disease forecasting models, etc.).

EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries > Viticulture
Research affiliation: France > GRAB - Groupe de Recherche en Agriculture biologique
Italy > ISMAA - S. Michele all’ Adige Agricultural Institute of TN Province
Related Links:http://www.grab.fr/category/nos-recherches/itineraire-technique
Deposited By: Parveaud, Dr Claude-Eric
ID Code:17821
Deposited On:07 Oct 2010 07:34
Last Modified:07 Oct 2010 12:25
Document Language:English
Refereed:Peer-reviewed and accepted

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