Reports from neighboring states have indicated corn rootworm larval hatch for 2009. June 6 has been considered an average hatch date in Iowa, so first and second instars should be actively feeding if present. This is the time to apply a rescue treatment for corn rootworm, and scouting will help determine if action is necessary.
Iowa State University
Hodgson, Erin W. and Tollefson, Jon J., "Time to Scout for Corn Rootworm Larvae" (2009). Integrated Crop Management News. 629.
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