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Stem paralysis

A vine disease (also called lame stem disease) caused by a lack of nutrients in the soil such as magnesium and ammonium, or also by excessive fertilisation with nitrogen. In France it is called Desséchement de la rafle (desiccation), in California Water Berry. The grape stalk (see pictures) or parts of the grape skeleton shrink and dry out, which prevents the grapes from being supplied with nutrients and prevents the berries from ripening, which results in a low sugar content. The disease initially manifests itself as small, sharply demarcated, dark necroses on the grape skeleton, no larger than the size of a pin, which rapidly increase in size. Eventually, extensive drying of the grape skeleton is caused, leading to total shriveling and wilting of the berries below the infested area.

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