Dryocosmus asymmetricus (Hymenoptera: Cynipidae) Split Twig Gall Wasp summit of Mt Diablo, Mt Diablo State Park, Contra Costa County, California October 21, 2006 On Quercus chrysolepis. The wasps have already emerged from the gall.
On Quercus chrysolepis. The wasps have already emerged from the gall.