Acari: Eriophyoidea - gall mite Aceria lissonota / Eriophyes lissonotus Photographs on Betula, Birch Hosts: Betula pubescens, B. pubescens x pendula Hairy upperside bulge, often near leaf base. Erineum hairs with acutely pointed tips, whitish when young Similar: Eriophyes leionotus. Smooth bulges in vein axils

Aceria lissonota
Studland Heath, Dorset. October 2017