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Photo#1252257
Rose Gall - Diplolepis rosae

Rose Gall - Diplolepis rosae
Castle Crags State Park, Shasta County, California, USA
June 28, 2016
Several of these conspicuous galls were growing on a California Wild Rose (Rosa californica). They are caused when the female wasp Diplolepis rosae lays its eggs in the leaf buds of the rose.