Insect Alert For

Corn Earworm

Risk Level:
Low Risk
Affected Area:
Full page
Alert Details

Very hot and humid conditions are expected across a good portion of the corn-growing region in the next several days, in fact some of the hottest weather all summer is likely across the heart of the corn-growing region. Southerly winds will accompany these conditions, and corn earworm migration risks are a definite possibility, as well. A cold front is likely to move southeast through the area by late week, however, and this will likely end the heat and humidity as well as pose a corn earworm migration risk. Low risks are in the forecast tonight into tomorrow mainly west of I-35 as a weak high pressure area in Illinois and Indiana keeps southerly winds focused further west of the Mississippi River. This is expected to change, however, as early as tomorrow and Moderate migration risks are predicted from Nebraska and southeast South Dakota into southern Minnesota, far southwest Wisconsin, and northern/central Iowa as the cold front begins to move slowly southeast. There is some concern over the lack of precipitation resulting in a more widespread insect drop zone near this front, but winds and conditions otherwise warrant the Moderate risk. Moderate risks continue in the forecast Wednesday night into Thursday from eastern Nebraska into Iowa, southern Wisconsin, northern Illinois, northern Indiana, and southwest lower Michigan as the front continues to move southeast. Little to no risk is predicted by the weekend, but growers with crops still at susceptible stages to damage, especially fresh market and processing crops, should monitor traps closely and scout fields as new moth migrations seem probable in the next week.