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Dryocosmus dubiosus
2222_1342 Photo added 2007-08-13

Dryocosmus dubiosus (Hymenoptera: Cynipidae)
Two-horned Gall Wasp
Knowland Park, Oakland, Alameda County, California
April 16, 2007

On Quercus agrifolia (coast live oak). This is the spring bisexual generation of the wasp; the galls develop in the catkins. Notice the exit hole in the gall in the lower right of the cluster.

all photos and text © Joyce Gross