Bark-gall
Guides
Callirhytis quercusfutilis
Oak Wart Gall Wasp
Callirhytis quercusfutilis is a cynipid gall wasp known for inducing distinctive wart-like galls on white oak group oaks. The species exhibits a complex life cycle with alternating generations: an asexual generation that develops in scurfy bark at the base of host tree trunks or roots, and a sexual generation that produces leaf galls. The species is restricted to central and eastern North America and is specifically associated with oaks in the Quercus section Quercus (white oaks).