Callirhytis serricornis

Callirhytis serricornis, formerly Andricus serricornis, the kernel flower gall wasp, is a species of hymenopteran that produces galls on oak trees in California in North America. The wasp oviposits on coast live oak and interior live oak and induces a gall shaped roughly like a bottle or vase. The gall is brown in the first generation, and red and green in the second.^[1][2]

Callirhytis serricornis
Callirhytis serricornis in Napa County, July 2022
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Cynipidae
Genus:	Callirhytis
Species:	C. serricornis
Binomial name
Callirhytis serricornis (Kinsey, 1922)