The Hessian fly (Fig.1) can be a destructive pest in wheat, although there haven't been many reports of this pest in recent Iowa history. Typically, resistant wheat varieties provide sufficient protection against the Hessian fly and growers do not have to adjust planting dates to avoid adult emergence. There are genetic biotypes that can attack resistant fields, and so monitoring for Hessian fly is recommended for wheat growers.
Iowa State University
Hodgson, Erin W., "Approaching Hessian Fly-free Dates in Iowa" (2009). Integrated Crop Management News. 548.
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