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0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

stem necrosis

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

A vine disease (also paralyzed) caused by a lack of nutrients in the ground like magnesium and ammonium or too extensive fertilization With nitrogen is caused. In France it is called Desséchement de la rafle (dehydration), in California it is called Water Berry . The grape stalk (see the pictures) or parts of the grape skeleton shrink and dry out, which prevents the grapes from being supplied, the berries cannot ripen and therefore have too low a sugar content. The disease initially manifests itself as small, sharply delineated, maximum pin-sized dark ones necrosis on the grape skeleton, which enlarge rapidly. Ultimately, the grape skeleton is dried out extensively, which leads to the shrinking and wilting of the berries below the infestation site.

Pedicle paralysis - advanced stage in the Grüner Veltliner, early stage in the Blaufränkisch

The varieties are particularly susceptible to pedicel disease Blaufränkisch. Cabernet Sauvignon. Chasselas. Green Valtellina. muscatel. Roesler, Vernatsch ( Schiava Grossa ) and Riesling, In South Tyrol, a special form that occurs particularly with the Vernatsch variety, in which the top of the grape is particularly affected, is known as a “speed camera”. The disease is combated or prevented, among other things, by magnesium spraying. But the pedicel is not allowed with the grapes wilt or the through Botrytis cinerea caused by stem rot, which have certain similarities in appearance, but have completely different causes.

Left picture: By farmer Karl - photographed by himself , CC BY 3.0 at , Link
Right picture: By farmer Karl - photographed by himself , CC BY 3.0 at , Link

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