Insect Alert For

Corn Earworm

Risk Level:
Moderate Risk Level
Affected Area:
Full page
Alert Details

A very favorable weather pattern for corn earworm migration is predicted across much of the corn-growing region at some point in the next five days. Persistent south to southwest flow is predicted especially across the Plains into the southwest Midwest overnight tonight into tomorrow morning, and Moderate migration risks are predicted across Kansas, southeast Nebraska, western and southwest Iowa, and northwest Missouri with Low risks as far north as southern Minnesota and east into southwest Wisconsin and western Illinois. The Moderate risk area expands northeast tomorrow night into Thursday morning and includes fields as far north as southeast South Dakota, southern Minnesota, and southwest Wisconsin with Low risks east to near Lake Michigan and eastern Illinois. As high pressure in the eastern Midwest and Ohio/Tennessee River valley shifts further southeast, the opportunity for south to southwest winds to spread further east will exist especially by late week and into next weekend. A cold front is predicted to pass through much of the corn-growing region by the weekend, and this may provide the best migration opportunity especially for the eastern half of the corn-growing region by that time as south to southwest winds will be originating in mid-south and Mississippi River valley source regions that currently contain active and high moth captures right now. Growers all across the corn-growing region should continue to monitor traps and also keep a close watch on those fields still at susceptible stages to damage. Processors, fresh-market, and vegetable growers in the upper Midwest and Great Lakes region are encouraged to monitor their traps and moth/larvae field activity in the coming week.