A gall mite which causes pouch galls to form on the leaves of Alder, in the angles between the midrib and the primary veins. They appear either alternately or in pairs and may run from the petiole to within two or three veins of the leaf apex. The galls are filled with russet hairs amongst which the mites live, and these hairs often project through to the underside of the leaf to form more or less triangular patches.
Wherever Alder is found.
Development begins in May and maturity is reached in August or September.
Widespread, but under recorded in Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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