Insect Alert For

Corn Earworm

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Alert Details

Corn earworm migration probabilities are on the rise in the next week as the weather pattern across the corn-growing region shifts in a more zonal or even southwest flow especially later this week and next weekend. For most of the summer, the weather pattern has been dominated by northwest flow, and this has kept corn earworm migration events rather limited. With the pattern shifting to a more favorable setup for potential migration, risks are being increased especially across central and western portions of the corn-growing region in the next five days as low pressure slowly moves through the Plains and upper Midwest and high pressure settles into the southeast United States. In between these two features, south to southwest winds are expected and may lead to migration events. Low risks are in place tonight mainly across Kansas and Nebraska as southerly winds commence in that area. Moderate risks, however, are in place across the same region in addition to southwest Iowa and northwest Missouri tomorrow night into Thursday morning as south to southwest winds increase. Low risks extend north into South Dakota, Minnesota, and Wisconsin as well as east into Illinois. Moderate risks are in place throughout the entire extended forecasting period as well, with the risk extending as far north as southeast South Dakota, Minnesota, and Wisconsin, and as far east as Illinois. Low risks are predicted into central Minnesota and Wisconsin as well as southwest Michigan and Indiana. Growers with crops at susceptible stages to damage are urged to monitor traps over the coming week, especially if in an area along or west of Lake Michigan and the Illinois/Indiana border as scattered moth flights will be possible.