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By mites (Blattgallmilben, smallpox mites) caused leaf disease (Latin Erineum vitis) at the time of sprouting, The adult pests overwinter under the bud scales. When bud swelling in the spring, they are by piercing the shoots and after the expulsion also to the Scroll and bills active. The plant reacts by forming Gallen These are small pinnae on the top of the leaves in the colors green, reddish, sulfur yellow and brown. With low infestation usually only the lower leaves are affected. In heavy infestation, the growth is stopped, the leaves wither and the shoots stunt. After several years of infestation, the vines can eventually die off. See also below Vine enemies,

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