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coulure

Term (French: coulure) for a fertilisation disorder on the vine. Other names for this disorder are "grapevine bud break", "bud break", "travelling through" and "trickling through". This can occur up to three weeks after flowering and is characterised by the loss of flower buds or young, usually still very small berries the size of peas, which fall from the stems (photo left). For the most part, this process is normal, as all the berries on a Weintraubegrape can never fully ripen. If fertilisation does not take place or is inadequate, the berries do not form at all because the flowers fall off. Depending on the grape variety, the flowering rate is only 30 to 60%. After flowering, the young grapes are most susceptible when they need vital carbohydrate resources in order to develop fully.

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