Abstract
Defoliation of the vines consists of eliminating the leaves in the grape bunch zone in a more or less intensive manner. It is a long-proven prophylactic technique that has seen a renewed interest in the current context of the reduction of phytosanitary inputs. However, several questions remain. Which is the optimal period? What is the ideal intensity? What are the risks? Is the mechanization of this process a feasible option? Agroscope has been undertaking defoliation trials in Switzerland since 2010 in order to shed light on these questions.
Highlights
The choice of defoliation timing must be undertaken judiciously in regards to the desired results
The Agroscope research station has set up defoliation trials on five grape varieties – Chasselas, Doral, Pinot noir, Gamay and Merlot – and in three experimental sites in the Lake Geneva region as well as in the Tessin region (South of the Alps)
The defoliation of the grape bunch zone is generally undertaken during the period of the formation of the bunches – after the berry set and before the veraison – while the vine is still in its growth phase
Summary
The choice of defoliation timing must be undertaken judiciously in regards to the desired results. The Agroscope research station has set up defoliation trials on five grape varieties – Chasselas, Doral, Pinot noir, Gamay and Merlot – and in three experimental sites in the Lake Geneva region as well as in the Tessin region (South of the Alps). The defoliation of the grape bunch zone is generally undertaken during the period of the formation of the bunches – after the berry set and before the veraison (color change) – while the vine is still in its growth phase.
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