Insect Alert For

Corn Earworm

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

An active weather pattern is predicted across much of the corn-growing region right into next week. As a result, daily corn earworm migration probabilities are in the forecast, with Moderate risks now in the forecast as we move into next week. Low risks are in place tonight from Kansas and Missouri northeast into far southeast Minnesota and southwest Wisconsin as a cold front moves southeast through the upper Midwest and Great Lakes region. Southwest winds ahead of, or southeast, of the front may pose an isolated moth flight risk but with winds weakening and turning increasingly from the west, probabilities are rather low at this time. Low risks then return to the Plains tomorrow night into Sunday morning ahead of a developing and deepening low pressure system across the far western Plains. By late in the weekend and early next week, low pressure is predicted to continue to deepen as high pressure moves into the eastern United States. A favorable corridor for southerly winds initially across the Plain and western Midwest is predicted to develop and then spread east into fields mainly west of Lake Michigan by the middle of next week ahead of a strong cold frontal passage. Moderate risks are in place initially across portions of Nebraska, South Dakota, Iowa, and southwest Minnesota next Monday night and Tuesday, and then across portions of far northern Missouri, eastern Iowa, southeast Minnesota, central and southern Wisconsin, and northwest Illinois Tuesday night and Wednesday. Growers should continue to scout regularly and monitor trap counts, especially across the central and northern portion of the corn-growing region as this is the area at greatest risk based on crop stage, and also as we move into August late next week when greatest corn earworm pressure usually focuses across the upper Midwest and Great Lakes region.