Insect Alert For

Corn Earworm

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

The weather pattern across at least a portion of the corn-growing region is predicted to become a little more active this week. As a result, corn earworm risks will be on the increase in some fields especially at the start of the forecasting period. A cold front has pushed through a portion of the central and eastern Midwest and Great Lakes region, with northwest winds being found to the north of the front and primarily southwest winds to the south. Corn earworm migration risks will be confined to fields right along and south of this front, with Low risks in place tonight into Tuesday morning across Kansas into Nebraska and then southeast into far southern Iowa and Missouri as well as central and southern Illinois, southern lower Michigan, Indiana, western Ohio, and far northwest Kentucky. As southerly winds increase tomorrow night into Wednesday morning, Moderate risks are predicted across portions of Kansas, Nebraska, Iowa, and Missouri where south to southwest winds originating from source regions mainly in Oklahoma will be maximized. Crops within the source region are moving past critical growth stages and corn earworm are not as attracted to local crops, so the tendency to move north may be present. Low risks are found as far north as I-90 and east into Illinois during this same time. The frontal boundary will begin to decrease in strength and also settle to the south as high pressure moves back into the Great Lakes region by late week, so only Low risks remain in place across the southern Midwest by Wednesday night into Thursday. Growers are advised to monitor fields this week as even though the overall risk for flights is isolated to scattered, source regions are less attractive and moths will begin moving north in the coming weeks with favorable weather conditions.