Hymenoptera: Cynipidae - gall wasp Andricus corruptrix Agamic generation - photographs on Quercus, Oak Hosts: Agamic generation on Quercus petraea, pubescens, robur Sexual generation on Quercus cerris Agamic - a usually terminal hard, woody, thin-walled gall with up to 5 weakly rounded lobes. Mature galls have a slightly pointed tip Sexual - smooth bud gall 2-2.5mm with pointed tip, very thin-walled with the lower half hidden by bud scales. Sexual galls and adults of A.lignicola, corruptrix, kollari are very difficult to separate

Andricus corruptrix
Broadstone, Dorset. September 2017