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leaf fall

Last section (also leaf fall) in the annual growth cycle of the grapevine after maturation = Maturity phase (see also under BBCH Code ). In plant science, the discarding of leaves, fruits and other plant parts such as deciduous and flower buds, twigs, spines, thorns or inflorescences is called abscission. In the northern hemisphere the leaf fall takes place from November to December, on the southern from May to June. The fall of the leaves is introduced in temperate latitudes mostly through the first night frost. Ideally, the leaf loss should be some time after the vintage done in late autumn. Then the leaves can still produce carbohydrates, lignify and mature the annual wood for hibernation and sufficient reserves in the trunk and the roots carbohydrates (Starch) are stored before the growth is stopped. each vine requires a variety-specific minimum period of the growing season, in order to carry out grape and wood maturity permanently. In frost-free areas, some leaves can reach the early spring exaggerated remain. After the leaf fall follows the Hibernation, in the after the pruning with the expulsion the buds on the annual shoots the vegetation cycle starts all over again.
discolored and dry grapevine leaves

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