2009-03-212009-03-211991https://hdl.handle.net/10365/2828Entomological Society of America.Insects.Weeds.Biological pest control agents.Leafy spurge.Host specificity of Spurgia esulae Gagne (Diptera: Cecidomyiidae), a gall midge introduced into the United States for control of leafy spurge (Euphorbia esula L. "complex")