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Corn Rootworm IPM

Regional Working Group


  • rootworm egg hatch map

    Corn Rootworm Egg Hatch Getting a Late Start in Iowa

    Corn rootworm egg hatch in Iowa occurs from late May to the middle of June, with an average peak hatching date of June 6 in central Iowa. In 2020, the expected hatching date will be behind the average due to cool spring temperatures. Development is driven by soil temperature and measured by growing degree days. Research suggests about 50% of egg hatch occurs between 684-767 accumulated degree days (base 52°F, soil). Most areas in Iowa will reach peak corn rootworm egg hatch in 5-7 days (Figure 1).

  • larva

    Scouting for corn rootworm larvae

    Today, with Ashley Dean and Angie Rieck-Hinz, I met Warren Pierson at FEEL to look for corn rootworm larvae. I predicted peak corn rootworm egg hatch for central Iowa this week based on accumulating degree days. We had no trouble finding larvae in refuge corn, ranging from ¼ to ½ inches in length. They were very active (wiggly) today.

  • ""

    The Handy Bt Trait Table - Sweet Corn Production February 2020 PDF

    The latest version of the table is always posted at For questions & corrections: Ben Phillips, Michigan State University ( Contributor: Pat Porter, Texas A&M University (web site host)

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