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.
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.