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Brewer's Oak apple. Applesized galls growing on Brewer' Oak Quercus garryana var breweri They have been made by the wasp Andricus quercuscalifornicus JIM CONRAD'S NATURALIST NEWSLETTER Issued from the Siskiyou Mountains west of Grants Pass Oregon USA backyardnature net htm backyardnature net Jim Conrad Jim Conrad See backyardnature