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Dryocosmus asymmetricus
2222_1128 Photo added 2006-12-15

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.

all photos and text © Joyce Gross