Hymenoptera: Cynipidae - gall wasp Andricus kollari Marble Gall Agamic generation (Marble Gall) - photographs on Quercus, Oak Hosts: Agamic generation on Q. frainetteo, petraea, pontica, pubescens, robur Sexual generation on Quercus cerris Agamic - gall has single thick-walled chamber with white larva but additional chambers often present containing iniquilines. Most frequent on immature or stunted trees. Introduced (to Devon) from the Middle East in 1830s Sexual - usually several elliptic or sausage-shaped bud galls with acute tips. Sexual galls and adults of A.lignicola, corruptrix, kollari are very difficult to separate

Andricus kollari, Marble Gall
Corfe Mullen, Dorset. August 2017