Insect Alert For

Corn Earworm

Risk Level:
Moderate Risk Level
Affected Area:
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Alert Details

Hot and humid conditions with near record high temperatures, as well as increasing south to southwest winds, are expected to continue across especially the western and central corn-growing region in the next few days. A cold front is expected to begin working its way south and southeast especially later tomorrow and into Thursday and Friday which will end the heat wave and return the area to northwest flow and much cooler and less humid conditions. Before that point, however, southwest winds may bring a corn earworm migration risk into some key growing areas in the corn-growing region the next few nights. Moderate migration risks are predicted tonight into tomorrow from eastern Nebraska and southeast South Dakota east into southern Minnesota, northern and central Iowa, and far western/southwestern Wisconsin. Low risks extend east to Lake Michigan and into Illinois. Moderate risks then shift east with the cold front tomorrow night into Thursday, and include Iowa, southeast Minnesota, Wisconsin, northern Illinois, northern Indiana, and southwest lower Michigan. Once the front clears much of the corn-growing region by Friday, little to no additional migration risk is predicted but fresh market and processing growers, especially, are encouraged to check traps and scout fields as new moths are expected to appear over the next several days.