Acari: Eriophyoidea - gall mite Aceria eriobia (Aceria macrocheluserinea) Photographs on Acer campestre, Field Maple Hosts: Acer campestre, pseudoplatanus, rubrum Galls with or without an upperside bulge. Erineum hairs are mushroom-shaped (apex very swollen), white becoming reddish-brown

Aceria eriobia
Badbury Rings, Dorset. August 2017