Galls, Diseases, and Pests - Flange Gall Wasp
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The Flange Gall is what is known as an "undescribed" gall. That means that no one has figured out what kind of wasp creates the gall. Flange galls are considered rare, but I have found many of them at Rockville Hills Regional Park. They are on Blue Oak (Quercus douglasii) leaves.
