Insect Alert For

Corn Earworm

Risk Level:
Moderate Risk Level
Affected Area:
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Alert Details

As high pressure departs to the east and a new area of low pressure and a trailing cold front develops in the High Plains, corn earworm migration risks will be on the increase over the next several days across a large portion of the corn-growing region. Low risks are predicted tonight generally west of the I-39 corridor in Wisconsin and Illinois as southerly winds increase. Moderate risks, however, enter the forecast for the next three nights beginning tomorrow night into Sunday across Nebraska, eastern South Dakota, Minnesota, Iowa, and western Wisconsin. By Sunday night into Monday, the risk area expands east to include the remainder of Wisconsin, much of northern and central Illinois, and also into northwest/western Indiana. By Monday night into Tuesday, as a cold front moves southeast, the Moderate risk area shifts mainly east of the I-57 corridor in eastern Illinois, Indiana, Ohio, lower Michigan, and into southern Ontario, Canada. Growers with crops at susceptible stages to corn earworm damage are encouraged to continue to monitor traps and scout fields, and apply treatments where warranted/timed, until the crop moves past a critical growth stage.