Insect Alert For

Corn Earworm

Risk Level:
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Alert Details

A very summer-like weather pattern is currently in place across much of the corn-growing region with southerly winds to the south/east of a low pressure system and associated frontal boundaries across the Plains and further east. Storm clusters are focusing near these boundaries, and these regions may also serve as the areas that see corn earworm drop-out as moths move north over the next few days. Growers with crops still at susceptible stages to damage, especially processors and fresh market growers, should continue to monitor traps and scout fields until the crop is harvested or no longer at a growth stage where damage could potentially occur. Low migration risks are predicted tonight into tomorrow generally west of the Mississippi River, with Low risks then spreading as far east as lower Michigan and Indiana tomorrow night. Southerly winds are expected to increase tomorrow into Saturday, and for this reason Moderate risks have been introduced to the forecast across far northeast Nebraska, eastern South Dakota, Minnesota, northern Iowa, and into Wisconsin during this time. As a cold front moves southeast, the main migration risk will focus further east in the less contaminated warm sector mainly east of I-35 Saturday night into Sunday. Little to no migration risk is currently predicted early next week, but moth presence and larvae activity should continue given multiple flight potentials in the last several weeks.