Canada thistle stem-gall fly (Urophora cardui) in EDDMapS Representative Photos

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adult gall fly

Eric Coombs, Oregon Department of Agriculture, Bugwood.org

adult gall fly

in gall

Norman E. Rees, USDA Agricultural Research Service - Retired, Bugwood.org

in gall

gall in stem

Norman E. Rees, USDA Agricultural Research Service - Retired, Bugwood.org

gall in stem

Canada thistle stem-gall fly (<em>Urophora cardui</em>) adult(s) on Canada thistle (<em>Cirsium arvense</em>)

Whitney Cranshaw, Colorado State University, Bugwood.org

Canada thistle stem-gall fly (Urophora cardui) adult(s) on Canada thistle (Cirsium arvense)