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Through global warming or climate Change the frequency of extreme temperatures has increased. This manifests itself in the increase in the number of tropical days (days with temperatures above 30 ° C); these are increasing every year. Especially on these days there can be negative effects on functions or direct damage in the vineyard Scroll and berries of vines come. The risk potential arises primarily from a hot period with very high temperatures after a cool period and very low ones humidity, Other causes are too radical Defoliation in the grape zone or defoliation by strong hailstorm, Effects include burn damage to exposed berries or grapes wilt after the berries have dried out. In the ripening phase, extreme temperatures have a significant influence on the malic acid; Temperatures of over 40 ° Celsius lead to a drastic decrease in the berries. The varieties are particularly sensitive Chardonnay. Green Valtellina. muscatel. Riesling. St. Laurent and Zweigelt, For preventive measures against damage see under Canopy management,

Sunburn - damage to the Grüner Veltliner grape and Riesling leaf and grape

Source: WIKIPEDIA - Consequences of global warming for viticulture
Images: By Bauer Karl - Own works, CC BY-SA 3.0 , Link 1 , Link 2 and Link 3
edited by Norbert FJ Tischelmayer - June 2019

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