Insect Alert For

Corn Earworm

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Alert Details

Corn earworm migration risks are on the increase this weekend and into early next week as a somewhat slow-moving low pressure system and attendant cold front moves through the corn-growing region. Southerly winds are already increasing in the Plains states and Low migration risks are predicted tonight into tomorrow as far east as the I-35 corridor from near Minneapolis, Minnesota south to western Missouri. Moderate risks then enter the forecast tomorrow night into Sunday across portions of Iowa, Minnesota, Wisconsin, and Illinois as southerly winds increase even more further to the east, with Low risks in slightly weaker winds into the southern Great Lakes and portions of the eastern corn-growing region. Moderate risks continue in the forecast Sunday night into Monday across Wisconsin, eastern Iowa, northern/central Illinois, northern Indiana, northern Ohio, southern lower Michigan, and into southern Ontario, Canada as the cold front begins to move southeast and south to southwest winds continue to spread eastward. Low risks remain in the forecast mainly across the southern Great Lakes and eastern corn-growing region next Monday night into Tuesday as the front finally moves across this region. Growers with crops at susceptible stages to corn earworm damage, including late-planted field corn but primarily fresh market and processing growers, should monitor traps closely next week but also continue regular scouting efforts as larvae from previous flights earlier this month may now be present.