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Photo#1072889
rosette gall on canada goldenrod, Solidago canadensis - Rhopalomyia

rosette gall on canada goldenrod, Solidago canadensis - Rhopalomyia
Canton, Norfolk County, Massachusetts, USA
August 1, 2010
Rosettes of this form are reportedly caused by the gall midge Rhopalomyia capitata Felt. Dorchin et al, Revision of the goldenrod-galling Rhopalomyia species (Diptera: Cecidomyiidae) in North America, Zootaxa 2152: 1–35 (2009). Larger image.

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rosette gall on canada goldenrod - Rhopalomyia rosette gall on canada goldenrod, Solidago canadensis - Rhopalomyia