Mites

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The mites (Acari) are a subclass of arachnids (Arachnida) in the phylum Arthropoda, which also includes ticks. With over 50,000 known species in well over 500 families, they are the most diverse group of arachnids. The insects, which range in size from 0.1 mm to 3 cm in ticks, have a cylindrical, spherical or disc-shaped body in many colours with four pairs of legs (often only three in the larval stage). Depending on the species, the life cycle consists of up to four developmental stages: egg, larva, nymph and adult. All active stages (except the eggs) can cause feeding damage and the resulting consequences on the plants.

Parasitic herbivores

In contrast to other arachnids, which are mostly predators, mites (Fig. 1) are mostly herbivores or live parasitically on plants or animals. The pictures show a mass infestation of a dung beetle (picture 2) and a weaver beetle infested with mites (picture 3). They are often also useful, as they play an important role in soil formation by feeding on animal or plant residues. A distinction is made between the groups of gall mites (Tetrapodili, tiny at 0.15 mm) and spider mites (Tetranychidae, up to 0.5 mm).

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Mites

Parasitic herbivores

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