Hymenoptera: Cynipidae - gall wasp Diplolepis mayri Photographs on Rosa, Rose sp. Hosts: Rosa canina, majalis, rubiginosa Usually forms a group of unilocular gall on buds or the underside of leaves. Initially soft, green or slightly reddish, becoming brown, hard and woody. Spines slender, unbranched, to 3mm in length. Similar: Galls of Diplolepis rosae have branched, wiry hairs Periclistus brandtii is an iniquiline of both Diplolepis mayri and D. rosae.

Diplolepis mayri
Badbury Rings, Dorset. October 2017