Insect Alert For

Corn Earworm

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

Corn earworm migration risks are expected to continue for the next five days as a low pressure system develops across the Plains states and slowly moves northeast into the upper Midwest and Great Lakes region by next week. With a persistent high pressure area located in the southern Appalachian Mountains and southeast United States, south to southwest winds are predicted to continue across much of the corn-growing region through next Tuesday. Low risks are in place tonight into Saturday morning mainly south of I-90 and mainly west of a line from Albert Lea, Minnesota to Waterloo, Iowa, and Columbia, Missouri as low pressure develops/deepens and south winds increase. Moderate risks return by Saturday night into Sunday morning south of I-90 and roughly west of I-35 as south to southwest winds increase due to an expected stronger pressure gradient in this region. Low risks extend east to Lake Michigan and I-57 in eastern Illinois and also north into North Dakota, Minnesota, and Wisconsin. As a cold front moves east by late in the weekend and early next week, Moderate risks also shift to the east and are more focused in the central portion of the corn-growing region from Kansas and Missouri northeast into Iowa, southern Minnesota, southern Wisconsin, and northwest/western Illinois. Low risks are predicted early next week as the low pressure system moves northeast and begins to weaken. South to southwest winds are not expected to be as strong so Low risks remain across the eastern corn-growing region and Great Lakes area, including portions of southwest Ontario, Canada, next Monday night and Tuesday morning. No migration risk is predicted thereafter as winds die down in between weather systems.