Corn earworm migration risks are on the increase by late week and especially into the weekend as high pressure drifts to the southeast, opening up the potential for southerly winds to spread back across much of the corn-growing region. Crops are becoming less suitable hosts in mid-south and even southern corn-growing region source regions now, so moth flights are expected to continue further north on favorable weather. Low risks are predicted across the Plains tomorrow night into Friday, and as far east as Lake Michigan and into Illinois Friday night into Saturday. Moderate risks are already in the forecast across Nebraska, Iowa, eastern South Dakota, Minnesota, and western Wisconsin by Saturday night into Sunday with Low risks into southwest lower Michigan and Indiana. Moderate risks then expand east to Lake Michigan and into Illinois Sunday night into Monday, with Low risks all the way east into southern Ontario, Canada and Ohio as a cold front begins to move southeast. Some corn earworm flights did occur into portions of the northern corn-growing region last weekend, and growers with crops at susceptible stages to damage are encouraged to continue to monitor traps and scout vulnerable fields.