Insect Alert For

Corn Earworm

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Alert Details

Corn earworm migration risks are predicted for the next four nights as low pressure becomes better organized in the High Plains and high pressure moves from the eastern Midwest/Great Lakes region into the eastern United States. In between the two pressure centers will be a good fetch of south to southwest winds from source regions in Texas, Oklahoma, and eventually further east into Arkansas and Louisiana. Given the time of year, however, only Low risks are being issued due to crop stage being at an unsusceptible stage to damage. Risks initially start out tonight into Friday morning across the Plains north into South Dakota, Minnesota, and Iowa but then expand east to Lake Michigan and the I-57 corridor across eastern Illinois by Friday night into Saturday morning. The risk area continues to shift east by the weekend and into early next week as a cold front eventually pushes through the majority of the corn-growing region from west to east. Wind speeds are expected to decrease with time but isolated flights could still occur early next week in the Great Lakes region and eastern Midwest as the front passes and precipitation serves as potential drop zone regions near the front.