Insect Alert For

Corn Earworm

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Alert Details

Northwest wind flow is expected to continue for the next few days so no risk of corn earworm migration is predicted through Wednesday morning. By late week and into next weekend, however, the overall weather pattern is expected to shift to westerly or southwesterly which may result in an increase in southerly winds across a portion of the corn-growing region. Low corn earworm migration risks initially return to the Plains states Wednesday night into Thursday morning and then expand north and east by next weekend. Fields as far north as South Dakota and Minnesota and as far east as extreme western Illinois may be impacted by isolated corn earworm flights by the weekend. The pressure gradient between low pressure across the northern Plains and high pressure in the southeastern United States, however, is not expected to be particularly strong so southerly winds through the duration of this forecasting period are only predicted to be light. As a result, only Low risks are predicted at this time.