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Acarynosis

Acarinosis (GB)
Grapevine disease (also known as ruffle disease), in which the leaves deform or shrivel, become discoloured and finally die off. It is caused by the ruffle mite; see under mites.

There is a rich order of around 17,000 species of tiny arachnids (Arachnida) with cylindrical, spherical or disc-shaped bodies in many colours with three or usually four pairs of legs (ticks are also included). In contrast to the other arachnids, which are mostly predatory, mites are mostly herbivores or live parasitically on plants or animals. Often they are also useful because they play an important role in soil formation by eating animal or plant residues. A distinction is made between two groups of gall mites (Tetrapodili, tiny at about 0.15 mm) and spider mites (Tetranychidae, up to about 0.5 mm).

Milben

Among the most important pests on the vine are the four species of leaf gall mite or smallpox mite (Eriophyes vitis), ruffle mite (Calepitrimerus vitis), red spider mite or fruit tree spider mite (Panonychus ulmi) and common spider mite or bean spider mite (Tetranychus urticae). They are also controlled with acaricides. Especially the gall mites are sensitive to sulphur. The mites have numerous natural enemies such as gall midges...

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