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Dryocosmus asymmetricus
2222_2365 Photo added 2012-10-13

Dryocosmus asymmetricus (Hymenoptera: Cynipidae)
Split Twig Gall Wasp
Angelo Coast Range Reserve, Mendocino County, California
April 23, 2008

Wasp-induced stem gall on canyon live oak (Quercus chrysolepis). The stem has split open, enabling the wasps to emerge. Old larval chambers, with holes where the wasps emerged, are visible.

all photos and text © Joyce Gross