Insect Alert For

Corn Earworm

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

A cold front is predicted to progress through much of the corn-growing region this week. In advance of this frontal passage, south to southwest winds are expected to increase owing to a greater pressure gradient between low pressure moving from west to east along the United States/Canada border and high pressure located in the southeast United States. Precipitation is also expected to become more widespread along the front as it moves southeast which may provide a favorable insect drop zone region. As a result, Moderate corn earworm migration risks are predicted, at some point, for much of the corn-growing region as this front moves through. Moderate risks are in place tonight across portions of Nebraska and Kansas with Low risks extending east into southern Minnesota, Iowa, and Missouri. The Moderate risk area expands northeast into Iowa and Missouri Tuesday night and Wednesday with Low risks as far east as the Mississippi River. By Wednesday night and Thursday, as low pressure moves from the northern Plains region east southeast into the Great Lakes, the Moderate risk area shifts east and encompasses fields from eastern Kansas into Missouri, eastern Iowa, southern/eastern Wisconsin, much of Illinois, Indiana, far northwest Kentucky, southern lower Michigan, and northwest/western Ohio. Low risks extend north into the north woods of Wisconsin, much of lower Michigan, Ontario, Canada, and Ohio/Kentucky. No risk is predicted thereafter as northwest winds lock in across the Plains and Midwest.