Starting in 2009, the Department of Entomology at Iowa State University received reports of severe corn rootworm injury in Bt corn in Iowa. In all cases, western corn rootworm was the predominant rootworm species in these fields (Fig. 1).
Iowa State University
Hodgson, Erin W. and Gassmann, Aaron J., "First Iowa Confirmation of Resistance to Bt Corn by Western Corn Rootworm" (2011). Integrated Crop Management News. 240.
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