A few areas of Iowa are approaching 50 percent corn rootworm egg hatch now (Figure 1), including the Muscatine area. Many other regions will be reaching 700 degree days within 7-14 days, depending on future temperatures. Cooler spring temperatures in 2013 have slowed down development, especially compared torootworm hatch last year.
Iowa State University
Hodgson, Erin W. and Sisson, Adam J., "Corn Rootworm Egg Hatch Underway in 2013" (2013). Integrated Crop Management News. 36.
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