Term (French: ‘coulure’) used to describe the shedding of flowers or young berries from the vine during its annual growth cycle, whilst flowering and the subsequent fruit set are taking place. Other names include ‘Abröhren’, ‘Ausreisen’, ‘Ausrieseln’, ‘Durchreisen’ and ‘Durchrieseln’. If fertilisation does not take place or if the further development of a young berry is halted prematurely, the flower or berry falls off and drops away.
During fruit set, only a proportion of the individual flowers develop into berries. A certain amount of loss of flowers and young berries is normal. Under normal conditions, the proportion of individual flowers that develop into berries is often around 30 to 50 per cent, though this depends heavily on the grape variety and environmental conditions.
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Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)