Water Berry

Common name in California for the vine stem paralysis disease; see there.

This vine disease (also known as lame stalk disease, in France Desséchement de la rafle, in California Water Berry) is a physiological disorder and belongs to the group of wilt diseases. However, stem rot should not be confused with grape wilt or stem rot (in Botrytis), which have similar symptoms but different causes.

Symptoms

The disease manifests itself as small, sharply demarcated, dark necroses (withering) on the grape cluster, no larger than the size of a pin, which rapidly increase in size. Ultimately, this causes extensive drying of the grape cluster, which leads to total shrivelling and wilting of the berries below the affected area.

Stiellähme - GV und Blaufränksich

A Grüner Veltliner grape at an advanced stage (left) and a BlaufränkischBlaufränkisch...

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