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Master Thesis

Effeuillage Précoce : efficacité dans le cadre de la lutte phytosanitaire et effets sur la maturité en Champagne

Abstract : Champagne is a wine region particularly under the pressure of fungal diseases. The climate conditions are perfect for the development of powdery mildew and Botrytis cinerea. The control is essentially made by chemical agents. It also exists prophylactic measures of control such as early leaf removal. We studied the cross-effect of vigor and early defoliation on diseases development, as well as on grapes maturity. Early defoliation is a way to control the effect of excessive vigor by reducing the density of the vegetative curtain. Even with a vintage like 2019 which rises very high temperatures (over 40°C), early leaf removal has no effect on grape sun burns. Early leaf removal proved to be very efficient to control fungal disease’s development. It improves grape’s microclimatic conditions and the quality of spraying with a much better rate of spray deposits on grapes. Monitoring of maturity shows that early defoliation has no effect on the composition of grapes and must, with the exception of acidity parameters. It would seem that total and tartaric acidities rise higher rates in leaf removes modalities.
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Master Thesis
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Alexandra Hervé. Effeuillage Précoce : efficacité dans le cadre de la lutte phytosanitaire et effets sur la maturité en Champagne. Agronomie. 2019. ⟨dumas-02971387⟩

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