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stem necrosis

grape strem rot (GB)
pourriture pédonculaire (F)
marciume del peduncolo (I)

A vine disease (also Lahmstieligkeit), by lack of nutrients in the ground like magnesium and ammonium or too extensive fertilization With nitrogen is caused. In France they are called Desséchement de la rafle ( Desiccation ), in California Water Berry . In the process, the grape stalks (see pictures) or parts of the grapevine shrink and dry up, which prevents the grapes from being fed, which can not ripen berries and therefore have too low a sugar content. The disease manifests itself first by small, sharply demarcated, maximum pin-sized dark necrosis on the grape structure, which grow rapidly. Ultimately, a far-reaching drying of the grape scaffold is effected, resulting in the total shrinkage and withering of the berries below the infestation site.

Steilähme - advanced stage at the Grüner Veltliner, early stage at Blaufränkisch

Particularly vulnerable to the stomping are the varieties Blaufränkisch. Cabernet Sauvignon. Chasselas. Green Valtellina. muscatel. Roesler, Vernatsch ( Schiava Grossa ) and Riesling, In South Tyrol, a special form occurring especially in the Vernatsch variety, which mainly affects the grape top, is called a "blitzer". The disease is controlled or prevented, inter alia, by magnesium injection. The Stiellähme but may not with the grapes wilt or by Botrytis cinerea stem rot caused confused, although the appearance has some similarities, but have completely different causes.

Picture left: By Bauer Karl - Self-photographed , CC BY 3.0 at , Link
Picture right: By Bauer Karl - Self-photographed , CC BY 3.0 at , Link

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