Insect Alert For

Corn Earworm

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

Signs of a weather pattern change across the corn-growing region may result in less than optimal corn earworm migration probabilities over the next week or so. Much of the corn-growing region has been dominated by southerly or southwesterly flow for the last week or so and there are indications now that much of this region may shift back to a northwest to southeast-dominated weather pattern. The result will be limited southerly winds to bring moths north and cooler temperatures to a good portion of the corn-growing region. Until this occurs, Low migration risks remain in place to the east of a cold front tonight into tomorrow morning especially from southeast Kansas northeast into southern Wisconsin and east into the southern Great Lakes and eastern Midwest. South to southwest winds in this area are not expected to be as strong due to a weakening of low pressure in Canada so only Low risks are predicted. No risk is predicted Thursday night into Friday morning. A Low risk returns to a portion of the Plains initially by Friday night and Saturday morning and then across much of the central corn-growing region from Kansas and Nebraska east into Illinois and Wisconsin as the next cold front advances east. Thereafter, high pressure builds into the Plains or western Midwest and may remain there potentially for a few days as deep low pressure meanders in the northeast United States. This pattern may block any southerly winds from reaching into the corn-growing region, so no risk is issued for early next week at this time.