Gall Wasps, Callirhytis quercusclaviger (Ashmead) and Callirhytis cornigera (Osten Sacken) (Insecta: Hymenoptera: Cynipidae) -- Figure 9. Mature horned oak galls caused by the gall wasp Callirhytis cornigera (Osten Sacken).

EENY-368: Gall Wasps, Callirhytis quercusclaviger (Ashmead) and Callirhytis cornigera (Osten Sacken) (Insecta: Hymenoptera: Cynipidae)

Figure 9. Mature horned oak galls caused by the gall wasp Callirhytis cornigera (Osten Sacken).

Credit: Minnesota Department of Natural Resources, www.forestryimages.org