Insect Alert For

Corn Earworm

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

A persistent south to southwest wind flow pattern is expected to occur across much of the corn-growing region in the next five days. With at least scattered coverage precipitation also predicted, corn earworm migration risks are on the increase with a Moderate risk in place for the next four days. Initially, Moderate risks remain primarily west of I-35 and south of I-90 across the central Plains and western Midwest tonight into Thursday morning but do expand east into the Mississippi River valley by Thursday night into Friday morning. As one low pressure system moves out and another one re-forms to the west Friday, migration risks refocus to the west of the Mississippi River Friday night into Saturday before shifting east with a cold frontal passage later in the weekend and into next week. Virtually all of the corn-growing region is under a Moderate risk at some point in the next four days, so growers with crops still at susceptible stages to damage from corn earworm should monitor their fields closely for potential scattered moth flights in the next week.