Insect Alert For

Corn Earworm

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

Corn earworm migration risks are on the increase for this weekend as a favorable pattern for migration is expected across a portion of the corn-growing region. Before the weekend, however, low pressure is expected to begin organizing in the High Plains/southern Canada today into tomorrow, and a corridor of southerly winds out in the Plains states is expected to develop today so Low migration risks are in the forecast tonight across that region. The Low risk expands east into Minnesota, Iowa, and Missouri tomorrow night into Friday, and then blossoms east all the way into the southern Great Lakes and eastern corn-growing region over the weekend as a heat dome builds in on strengthening southerly winds. Moderate risks have been introduced to the forecast across eastern South Dakota, northeast Nebraska, northern Iowa, and Minnesota Friday night into Saturday, with the Moderate risk then shifting east a little bit and focusing in Iowa, northern Illinois, southeast Minnesota, and Wisconsin Saturday night into Sunday ahead of a cold front. Growers located in or near the Moderate risk area should be monitoring traps and scouting fields closely as some moth flights may have occurred last weekend, as well, with additional flights possible this weekend. We are beginning to transition favorable hosts more into the primary corn-growing region now especially with mid-south crops advancing further into growth and becoming less attractive with time, so expect continued migration risks on favorable weather setups over the next 2-3 weeks further north.