Insect Alert For

Corn Earworm

Risk Level:
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Alert Details

The active weather pattern that has been in place across the corn-growing region for the past few weeks is predicted to continue for at least a portion of this week. Another cold front is expected to pass southeast through the corn-growing region by late week. This front may pose the next isolated to scattered corn earworm migration risk especially for the southeastern two-thirds of the corn-growing region and especially for the upper Midwest and Great Lakes region where crops are most likely still at susceptible stages to damage. Low risks are in place tonight across Nebraska, Kansas, western Iowa, and far western Missouri as southerly winds begin to increase ahead of a developing area of low pressure east of the Rocky Mountains. As high pressure moves from the eastern Midwest into the Carolinas by tomorrow and tomorrow night, south to southwest winds are predicted to really blossom to the east and Moderate risks are in place ahead of a cold front from southeast Nebraska into Iowa, southeast Minnesota, central and southern Wisconsin, far northern Missouri, and northern Illinois where scattered moth flights will be possible. Low risks extend east into the southwestern Great Lakes region. By Thursday night and Friday morning, Moderate risks are still in the forecast from northeast Missouri into eastern Iowa, southeast Wisconsin, northern and central Illinois, northern Indiana, northwest Ohio, and southern lower Michigan as the cold front moves east and also as southerly winds focus further east of the front. Precipitation is likely along and ahead of the front and may provide a favorable drop zone region. Low risks extend east into southern Ontario, Canada and into Ohio as well. Growers especially located in the upper Midwest and Great Lakes region are advised to continue to monitor traps and fields as numerous corn earworm flights have been reported in the last week or so and may pose a threat to later planted fields in the next few weeks.