Insect Alert For

Corn Earworm

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Alert Details

Much of the corn-growing region is expected to be in between low pressure systems for the next few days so corn earworm migration risks are not predicted until later this week and into next weekend. A cold front is currently passing through the western Great Lakes region and central corn-growing region with a good push of northwest to westerly winds in its wake across the Plains and western Midwest. This front will continue moving east today and out of the corn-growing region and into the eastern United States by tomorrow morning. With the front expected to outrun nocturnal migration possibilities, no migration risk is predicted with this particular system. The primary focus of this forecasting cycle comes in the extended forecast period as the next low pressure system develops in the Rockies and high pressure drifts off the east and southeast out of the Midwest by late this week and into next weekend. Southerly winds in advance of a trailing cold front should slowly expand east from late week into next weekend. All migration threats are kept rather low due to non-optimal wind speeds and crop stages across areas that would be at risk. Low risks are initially in place for Wednesday/Thursday south of I-90 and west of I-35 with the risk spreading slightly north and east to the US 12 corridor from South Dakota into Minnesota and also along/west of a line from southwest Missouri into eastern Iowa and far western Wisconsin for the following two nights.