Insect Alert For

Corn Earworm

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

Corn earworm migration risks remain in the forecast into next weekend as a cold front slowly pushes its way southeast through the corn-growing region. South to southwest winds are likely especially to the south of a northwest-southeast positioned warm front/outflow boundary which will commonly be located from South Dakota into southern Minnesota/northern Iowa and then east into northern Illinois. Precipitation will be periodically observed along and especially north of the front, and may serve as an opportunity for migrating corn earworm moths to fall from the sky. Low risks are predicted tonight into tomorrow morning mainly west of I-35 and south of US 12, or from Kansas and western Missouri north into South Dakota and southern Minnesota. As the cold front pushes southeast by the weekend, migration risks actually increase given expected stronger southerly winds tomorrow night into Saturday morning. As a result, Moderate risks are in the forecast across far eastern Nebraska, much of Iowa, southern Wisconsin, and northern Illinois with Low risks as far east as the Illinois/Indiana border. Low risks then continue east with the front Saturday night into Sunday morning with risks primarily east of the I-55 corridor in Illinois. Growers should continue to monitor traps closely and scout fields for moths/larvae especially if crops are at a susceptible stage of damage.