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sunburn

Due to global warming or the climate Change the frequency of extreme temperatures has risen. This is reflected in the increase in the number of tropical days (days with temperatures above 30 ° C); these are increasing every year. Especially on these days it may be in the vineyard to negatively affect functions or direct damage Scroll and berries of vines come. The danger potential arises above all by a heat period with very high temperatures after a cool period as well as very low humidity, Other causes are too radical Defoliation in the grape zone or defoliation by strong hailstorm, Effects are burn damage on exposed berries or grapes wilt after previous drying of berry stalks. In the maturation phase, extreme temperatures have a significant influence on the malic acid; Temperatures of over 40 ° Celsius lead to a drastic decrease in the berries. Particularly sensitive are the varieties Chardonnay. Green Valtellina. muscatel. Riesling. St. Laurent and Zweigelt, For preventive measures against damages see under Canopy Management,

Sunburn - Damage to grape from Grüner Veltliner as well as leaf and grape from Riesling

Source: WIKIPEDIA - consequences of global warming for viticulture
Pictures: 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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