Insect Alert For

Corn Earworm

Risk Level:
Moderate Risk Level
Affected Area:
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Alert Details

A compact but somewhat intense low pressure area is predicted to pass through the corn-growing region this week. South to southwest winds along and ahead of a trailing cold front to the south of the low pressure system may result in scattered corn earworm migration possibilities for portions of the corn-growing region the next few nights. High pressure is expected to hold in place across the upper Great Lakes region and eastern Midwest, so any migration possibilities in that area look less than previously thought, but moth flight chances are being increased especially tomorrow night into Thursday morning across a portion of the Midwest. Moderate risks are in place tonight into tomorrow morning across Kansas, Nebraska, western Iowa, and northwest Missouri with Low risks into South Dakota, Minnesota, southwest Wisconsin, western Illinois, and the remainder of Missouri. A Moderate risk is now predicted tomorrow night into Thursday morning across eastern Kansas, Missouri, southern and eastern Iowa, and western Illinois. Low risks extend north into Minnesota and Wisconsin and also east into eastern Illinois during this time. A Low risk is also maintained in the forecast mainly south of I-80 and west of I-65 for Thursday night into Friday as some weak southerly flow will be possible in this area. Growers located especially west of Lake Michigan and south of I-90 should prepare for potential scattered corn earworm moth flights in the next couple nights as corn earworm populations are active in source regions in the southern Plains and mid-south. Additionally, crops within the source region are moving past or are already becoming unattractive to corn earworm and migration north is becoming more likely in the coming weeks with favorable weather.