Wasp hatched from the two-horned gall shown below, on lower leaf surface of Live Oak, Quercus agrifolia (or wislizenii?). Pacific Coast Trail near Warner Springs, San Diego County, CA. 3/22/10. © Peter J. Bryant. #2 PBCAG-097

Two-horned Gall Wasp

Dryocosmus dubiosus

(Tentative ID based on gall type)

Hymenoptera: Cynipidae

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Two-horned gall on lower leaf surface of Live Oak, Quercus agrifolia (or wislizenii?), after hatching of wasp on the right. Pacific Coast Trail near Warner Springs, San Diego County, CA. 3/22/10. . © Peter J. Bryant.
Two-horned gall on lower leaf surface of Live Oak, Quercus agrifolia (or wislizenii?). Pacific Coast Trail near Warner Springs, San Diego County, CA. 3/22/10. © Peter J. Bryant.