Forecast and control of downy mildew (Plasmopara viticola) infections using weather stations | Prevision et gestion des infections du mildiou de la vigne (Plasmopara viticola) a l'aide d'une station d'avertissement
2001
Viret, O. | Bloesch, B. | Taillens, J. (Station federale de recherches en production vegetale de Changins (RAC), Nyon (Switzerland)) | Siegfried, W. (Station federale de recherches en arboriculture, viticulture et horticulture (FAW), Waedenswil (Switzerland)) | Dupuis, D. (Domaine de la Fine Goutte, Perroy (Switzerland))
The control of grape downy mildew requires the use of fungicides at regular intervals. Experiments have been conducted in Switzerland since 1990 to apply fungicides according to the epidemiological development of the diseases, as indicated by the forecasting systems Lufft HP-100. The sensors measure average temperature, relative humidity, rainfall and leaf wetness duration remain within the accepted tolerance, except for the maximal temperatures. Depending on the conditions, the number of sprays could be reduced up to 28/. Forecast of the first primary infection remains the critical event, which requests better biological knowledge of the pathogen. Indications given by the weather station HP-100 on the infections and incubation time are important tools as a decision aid, but they cannot be dissociated from the evolution of disease symptoms in unsprayed plots, from weather forecast, number of new leaves and from the epidemiology of the powdery mildew.
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