Insect Alert For

Corn Earworm

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Alert Details

A continued southwest to northeast flow weather pattern especially across the western corn-growing region may result in persistent isolated to scattered corn earworm migration events over the course of the next week. By next weekend and into next week, risks may also spread further east into the Great Lakes region and eastern Midwest, but for now, the primary area of concern is mainly west of Lake Michigan and I-57 in Illinois. A weak cool front is expected to push south from the Great Lakes and upper Midwest into the central corn-growing region late tonight into tomorrow and this may compress migration risks to fields mainly along and south of US 20 from Nebraska east into Iowa, northern Illinois, and into Indiana and far western Ohio. The migration risk focuses back west across the Plains for tomorrow night into Thursday morning as the front lifts back north as a warm front in that area. By the end of the week and into next weekend, south to southwest are predicted to increase and spread northeast. As a result, Moderate migration risks are predicted for portions of Kansas, Nebraska, South Dakota, North Dakota, Minnesota, Iowa, Missouri, Illinois, and Wisconsin starting Thursday night and continuing into the weekend. Growers with crops still at susceptible stages to damage from corn earworm should monitor their fields closely and be prepared to take action, if necessary, as the risk for a later season migration is present.