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Fungal Disease

Leaf disease (lat. Erineum vitis) caused by mites (leaf gall mites, pox mites) at the time of budding. The adult pests spend the winter under the bud scales. During bud swelling in spring, they become active by piercing the shoots and, after budding, also on the leaves and shingles. The plant reacts by producing bile, i.e. pox-like elevations on the upper side of the leaves in the colours green, reddish, sulphur yellow and brown. In case of low infestation, only the lower leaves are usually affected. If the infestation is severe, growth stops, the leaves wither and the shoots wither. If the infestation lasts for several years, the vines may eventually die. See also under vine enemies.

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