Corn earworm migration risks will be on the increase by tomorrow night through Friday morning as a cold front works its way southeast through much of the corn-growing region. South to southwest winds to the southeast of the front should lead to scattered moth flights into portions of the upper Midwest and Great Lakes region. Low risks are in place tonight from Kansas and Missouri northeast into Iowa, southeast Nebraska, western Illinois, and southwest Wisconsin as mainly light south to southwest winds may interact with precipitation to produce isolated corn earworm drop zones. As a stronger low pressure system develops in the Plains tomorrow into Thursday, south to southwest winds will increase. The result should be an increase in potential moth flights, as well, with Moderate risks from Nebraska and western/central Iowa north into eastern South Dakota and central/southern Minnesota. As a cold front moves southeast, the Moderate risk area is shifted southeast Thursday night into Friday, as well, and includes northeast and eastern Iowa, far southeast Minnesota, Wisconsin, northern and central Illinois, northern Indiana, northwest Ohio, and central/southern lower Michigan. Low risks extend into southern Ontario, Canada and Ohio. No additional risks are predicted at this time after midday Friday, but growers are encouraged to monitor traps and scout fields.