Phytoptus avellanae, Cecidophyopsis vermiformis

Pictures:  Abnormal buds     Female flower becoming into big buds galls      Nymphs inside a bud

Description

White,small, 0.3 mm long, with numerous tergites and sternites. 

Biology and Damage

They attacks the cellular walls of the internal parts of the current year's bud shoots, which, as early as September, begin to become larger and deformed. In spring , the females leave the deformed buds to invade the young leaves and lay eggs. The nymphs develop freely and change into adults in June-July before invading the new buds of the current year's shoots. The adults breed in autumn and winter. This pest causes important reductions in the harvest. The attacked buds begin to become deformed as early as September, they enlarge and external scales widen considerably. The buds destined to give female flowers seem to be preferentially invaded.

Common Names

DE: Haselnussgallmilbe, Haselnuss- Knospengallmilbe, ES: Badoc del avellano,  FR: Phytopte du noisetier,  IT: Eriofide del nocciolo,  GB: Filbert bud mite, Hazelnut gall mite,  TR: Fýndýk kozalak akarý