Insect Alert For

Corn Earworm

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

A rather persistent weather pattern is predicted to hold right into the holiday weekend and potentially into next week in at least a portion of the corn-growing region until a cold front pushes southeast and brings a return to northwest flow. In the meantime, south to southwest winds between high pressure across the Ohio River valley and low pressure systems across the northern Plains and into southern Canada will result in isolated, or Low, corn earworm migration chances from Kansas and Missouri north into Nebraska, Iowa, South Dakota, southeast North Dakota, and Minnesota. Some short-distance migration events may also continue especially in portions of Illinois and Wisconsin from source region populations in the St. Louis, Missouri area and adjacent sections of southwest Illinois for the next few nights. Additional Low risk areas are expected to eventually spread into the eastern corn-growing region and Great Lakes area as a cold front eventually settles southeast but likely stalls out from the Plains east northeast into the southern Great Lakes region early next week. Low risks will remain in the forecast especially across the Great Lakes region late in the weekend and into the early-middle portion of next week, both for short and long-distance flight possibilities. Fresh market and processing crops growers, especially in the upper Midwest and Great Lakes region where crops are still at susceptible stages to damage, should continue to monitor traps and scout fields as several reports of corn earworm flights within the past few weeks and various larvae stages are present in these fields with additional isolated flights also occurring this week especially in Illinois and Wisconsin. These fields are especially attractive to corn earworms as most field corn is now past critical stages.