Insect Alert For

Corn Earworm

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

A cold front will make its way east through the central and eastern corn-growing region through the next 24-36 hours. High pressure is expected to hold across the eastern part of the country, so a favorable weather pattern for at least scattered corn earworm migration will remain in place until this cold front passes through. Moderate migration risks are predicted tonight into tomorrow morning from southeast Iowa and northern Illinois northeast into southern Wisconsin, southern and central lower Michigan, northern Indiana, and northwest Ohio. Low risks extend east into southern Ontario, Canada and the remainder of Ohio as well as western Pennsylvania. Wind flow is predicted to turn much more westerly and northwesterly which should end the threat of migration until late in the weekend and early next week ahead of the next weather system. Low risks are in place at that time mainly west of Lake Michigan. Growers are advised that primarily the fresh-market and processing growers are being impacted by any migrating corn earworm at this point in the growing season, but there may be some very late planted field corn especially in the upper Midwest and Great Lakes region in Michigan that could still be at susceptible stages to damage. Growers in one or more of these scenarios are encouraged to watch for larvae until crops advance past critical growth stages.