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Corn Rootworm egg Hatch Behind Schedule this Year

June 21, 2022

Corn rootworm egg hatch in Iowa typically occurs from late May to the middle of June, with an average peak hatching date of June 6 in central Iowa. Even with recent warm temperatures, hatching is a bit delayed this year due to cool spring temperatures. Development is driven by soil temperature and measured by growing degree days (GDDs). Research suggests about 50% of egg hatch occurs between 684-767 accumulated GDDs (since January 1; base 52°F, soil). Many areas have reached peak corn rootworm egg hatch, and the northern portion of the state could experience peak hatch within a week (Figure 1).

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