This vine disease is caused by the asexually reproducing plant-pathogenic fungus "Greeneria uvicola", which attacks the ripe grapes (especially overripe berries damaged by bird damage, for example) in humid weather. The disease has so far not occurred in Europe, but exclusively overseas (Australia, New Zealand, eastern USA and Asia). The infested berries cause an unpleasant bitter taste in the wine, which negatively affects the aromas. The rot is controlled in the vineyard by fungicides. See also a list under vine enemies.
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Thorsten Rahn
Restaurantleiter, Sommelier, Weindozent und Autor; Dresden