Hymenoptera: Cynipidae - gall wasp Callirhytis erythrocephala Agamic, photographs on Quercus x hispanica (Q. cerris x suber). Hosts: Agamic generation on Querus cerris Sexual generation on Querus robur Agamic - acorn galls with 2-8 chambers, take two years to mature. Sexual - chambers under bark of 1-year twigs, only sign is exit holes C. glandium; identical galls, not yet recorded in GB. Adults must be reared. Agamic: Querus cerris, faginea, pubescens, pyrenaica, robur Sexual: Quercus cerris, ilex, robur, suber Associated insects include Eurytoma brunniventris, Megastigmus dorsalis, also Sycophila biguttata and a Synergus sp.

Callirhytis erythrocephala
Kingston Lacy, Dorset. December 2017