Climate change has increased the frequency of extreme temperatures. This is reflected in the increase in the number of tropical days (days with temperatures above 30 °C); these are increasing every year. On these days in particular, heat stress can have a negative impact on vineyard functions and cause direct damage to vine leaves and berries. The potential danger arises primarily from a hot spell with very high temperatures after a cool period and very low humidity. Other causes are too radical defoliation in the grape zone or defoliation due to heavy hailstorms.
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Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)