Acari: Eriophyoidea - gall mite Acalitus calycophthirus Birch Big bud Photographs on Betula pendula, Betula pubescens, Birch Hosts: Betula pendula, Betula pubescens Can be found throughout the year but most noticeable in winter. Harder galls are formed on Betula pendula and these can remain for several years

Acalitus calycophthirus, Birch Big bud
Studland Heath, Dorset. April and September 2014