L'effeuillage précoce : quels leviers pour son développement en Champagne ?

Abstract : In the current context of pesticides reduction which is imposed by the ECOPHYTO II plan, the development of early leaf removal carve out a place by reducing fungicides used, especially against bunch rot. Facing a difficult climatic context, the substantial number of leaf removers already present in Champagne gives the opportunity to develop such a technique. The Champagne Committee established the goal to stimulate leaf removing by lifting the impediments to its development. It aims to identify the good points and the most suited settings of each type of leaf removers to provide recommendations later on. It is also about checking that leaf removal do not compromised crop of grapes by causing injuries to the grapes, increasing risks of sunburn or by depreciate ripeness. Thus a network has been established in 2016 on 18 locations throughout the Champagne vineyard. “Strip trials” has established on each location to identify the most suited settings according to the leaf removal ratio, the injury rate and the decay rate. The ripeness was checked on the basis of the weight of 200 berries, the potential alcohol level and the total acidity titratable acidity. A survey was also conducted among all the winegrowers. Generally no negative effects have been found whether they be sunburn, injuries to the grapes or ripeness differences. The decay rate is significantly lower for the vines which leaves have been removed. Despite several biases, the leaf removal ratio has been confirmed for most of the levels. The survey identified the most relevant settings and to confirmed the practices of the most experienced winegrowers. In this way, the network enabled to shed light on early leaf removal by lifting major impediments and collecting data which can be used to provide recommendations.
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Master Thesis
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Antoine Roche. L'effeuillage précoce : quels leviers pour son développement en Champagne ?. Sciences agricoles. 2016. ⟨dumas-01437498⟩

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