Insect Alert For

Corn Earworm

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

A cold front will be pushing through a good portion of the corn-growing region over the next 48-72 hours. Ahead of the front, south to southwest winds will increase and may result in scattered corn earworm moth flights as precipitation is also expected along/east of the front which may serve as insect drop zones. Moderate corn earworm migration risks are predicted tonight into tomorrow morning across eastern Nebraska, much of Iowa, eastern South Dakota, southern Minnesota, and western Wisconsin. Low risks extend east to near Lake Michigan in Wisconsin and across northwest Illinois into Missouri and Kansas. Tomorrow night, as the front moves to the east, corn earworm migration risks also shift to the east and include fields mainly along and east of I-35, or from eastern Iowa into southeast Minnesota, central/southern Wisconsin, northern Illinois, far northwest Indiana, and extreme southwest and west central lower Michigan. Low risks extend as far east as I-75 in southeast lower Michigan and northwest Ohio. Once this front passes through, no migration risks are predicted in the long-range period. Growers, however, are urged to monitor trap counts and scout fields as corn earworm flights have been confirmed in scattered locations in the upper Midwest this week, especially from Minnesota east into Michigan.