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chlorosis (GB)
clorosi (I)
clorosis (ES)

Designation (also jaundice, bleach addiction) for one Rebstock's disease which is characterized by yellowing of the leaves shows. Cause is mostly nutrient deficiency and partly also surplus boron. iron. calcium. magnesium. manganese. sulfur. nitrogen or zinc as well as too high a content salt in the ground, As a result, the chlorophyll (leaf green), which is responsible for the rich green color of the leaves, is either not properly formed or even degraded. By the degradation and the retention of the yellow dyes ( carotenoids ), the leaves turn to a bright yellow, the leaf veins often remain dark green. As a rule, the young leaves are affected first. Later, the leaves dry from the outside in, which is called necrosis (Deterioration). At the time of blossom can do that Verrieseln and millerandage to be triggered. Also water stress (Lack of water) can lead to chlorosis. Some grape varieties like Müller-Thurgau. Pinot Noir. Syrah and Traminer (Savagnin Blanc) are particularly vulnerable. Remedy can be a suitable greening create.

Chlorosis - chlorotic vines and a yellowed leaf

large picture: By Karl Bauer - Self-photographed , CC BY 3.0 at , Link
Blatt: The Virtual Rebendoktor - Information Service Weinsberg

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