Spotted knapweed seed (left) and gall of Urophora quadrifasciata (similar to Urophora affinis) with larva.
Photo: from slide show: Biological Control of Noxious Weeds, by Reeves Petrof, by R. Richard.
spotted knapweed seeds. Photo by T. Breitenfeldt, 1/2000.
Gall fly gall above Lincoln's ear on penny. Spotted knapweed seeds in various stages of maturaty. photo by Jake Lehmann, Whitehall Middle School 7th grader. 4/00.
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