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chlorosis

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

Term (also jaundice, bleaching addiction) for one Rebstock's disease, which is characterized by yellowing of the leaves shows. The cause is mostly nutrient deficiency and partly also surplus boron. iron. calcium. magnesium. manganese. sulfur. nitrogen or zinc as well as too high content of 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 broken down. By breaking down and leaving the yellow dyes ( carotenoids ) the leaves change to a bright yellow, with the leaf veins often remaining dark green. As a rule, the young leaves are affected first. Later the leaves dry in from the outside in, what is called necrosis (Wither). At the time of blossom can thereby 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 susceptible to this. A suitable remedy greening create.

Chlorose - chlorotic vines and a yellowed leaf

Large picture: By Karl Bauer - self-photographed , CC BY 3.0 at , Link
Leaf: The virtual vine doctor - information service Weinsberg

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