Diptera: Cecidomyiidae - gall midge Polystepha malpighii Galls on Quercus, Oak Hosts: Quercus petrea, pubescens, robur The galls of Polystepha malpighii and P. quercus are identical and can only be identified reliably by breeding but P. quercus has not been recorded in Britain and Ireland

Polystepha malpighii
Corfe Mullen, Dorset. June 2019