Bryobia cristata Duges Grasspear bryobia mite

This polyphagous bryobia mite occurs throughout the year on grasses and herbaceous plants, including various ornamentals. They feed on the upper surface of the leaves and cause speckling and silvering. There are several generations annually, and breeding continues throughout the year. Although there is no period of winter diapause, development is greatly protracted during cold weather. In late spring, infestations sometimes extend to trees and shrubs, including fruit trees and ornamentals, before a return migration to more normal hosts; such attacks, however, are of little or no importance. In common with Bryobia praetiosa (above) (from which it is distinguishable by the slightly narrower dorsal setae and other microscopic features), this mite often aggregates on walls and may enter buildings to lay eggs, especially in May and June.

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