Insect Alert For

Corn Earworm

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Alert Details

Corn earworm migration risks are predicted to be limited to the Plains and western Corn Belt region the next five days as high pressure in the southeast United States causes weather systems to move from the Plains northward into Canada versus more west to east. On Wednesday night into Thursday morning, south to southwest winds that may result in isolated corn earworm flights are expected to remain confined in Nebraska, western Iowa, and points to the south as low pressure develops east of the Front Range. With the source region expected to be in western Texas, only Low risks are predicted due to poor crop conditions and developmental stages in that region. The risk area expands slightly north and east by Thursday night into Friday morning as low pressure tracks from the Dakotas into Canada. Field sites as far east as southern Wisconsin and western Illinois may see some isolated flights occur. Thereafter, no risk of corn earworm migration is predicted as high pressure in the southeast United States moves back west and essentially cuts off any southerly flow from active source regions in the southern and mid-southern United States.