Multi-chambered-gall
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Rhopalomyia lobata
Rhopalomyia lobata is a gall midge (family Cecidomyiidae) that induces large, multi-chambered galls on the stems and buds of Euthamia graminifolia (grass-leaved goldenrod). The species has a broad North American distribution spanning from Florida to Oregon and northward across Canada. Adult emergence occurs during late June to mid-July, after which the galls desiccate and persist on host plants for several weeks.