Efficacy of the leaf area adapted dosage of fungicides in viticulture | Dosage des fongicides adapté à la surface foliaire en viticulture: efficacité de la lutte
2010
Viret, O. | Dubuis, P.-H. | Bloesch, B. | Fabre, A.-L., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland) | Dupuis, D.
In viticulture, a fix hectare or hectoliter dosage of plant protection products is not suitable, because the leaf area vary considerably during the growing season. The current Swiss dosage system consists in a linear adaptation, following the phenological development of the vine. Leaf area adapted dosage is aimed at delivering exactly the amount of product requested for a given leaf area present at the time of spraying. An easy and user friendly calculation module is available on www.agrometeo.ch. Between 2005 and 2009, field trials performed at Perroy (VD) have shown that the crop adapted dosage lead to an average reduction of 20 % of the quantity of fungicides applied yearly without difference in efficacy compared to the standard dosage currently used in Switzerland. Besides decreasing the impact on the environment, crop adapted spraying allowed a cost reduction of 17 %, corresponding to a decrease of 157 CHF per hectare. Crop adapted spraying makes it possible to adapt the dose according to an objective base, in order to obtain a constant quantity of active ingredient per leaf area unit during the whole growing period of the vine.
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