Insect Alert For

Corn Earworm

Risk Level:
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Alert Details

A cold front will move through the majority of the corn-growing region late this week and into the weekend. As it does so, corn earworm migration possibilities will increase along and ahead of the front as southwest winds combine with at least scattered precipitation areas. A low migration risk is in place tonight into Thursday morning primarily across the Plains and upper Midwest as southwest winds on the backside of High pressure currently in the western Ohio River valley persist. As winds increase and a front approaches portions of the upper Midwest and central Plains by late Thursday into Friday, a Moderate migration risk is in place mainly west of a line from Wichita, Kansas to near Milwaukee, Wisconsin with Low risks north of the Ohio River into Ohio and Michigan. As the cold front advances southeast, Moderate risks also shift southeast and mainly focus from eastern Missouri into Illinois and extreme southeast Wisconsin and points east. A brief lull in migration risks exists by Saturday night into Sunday, but the next weather system is already predicted to start advancing into the Plains by the weekend. To account for the potential of southerly winds returning by that time, Low migration risks have been introduced for areas south of I-90 and primarily west of the Mississippi River. Growers all across the corn-growing region are urged to monitor their fields for signs of corn earworm and take appropriate action, if needed, in the coming week.