Insect Alert For

Corn Earworm

Risk Level:
No Risk
Affected Area:
Full page
Alert Details

The weather pattern will become more conducive for at least isolated corn earworm moth flights across a portion of the corn-growing region as we move through the weekend and especially into next week. The weather across the central United States has been dominated by a persistent northwest to southeast flow since mid-July. As a result, corn earworm moth flight opportunities have been more limited as a whole. As the weather pattern shifts back to a more zonal or even southwest to northeast flow next week, prospects for flights may increase but at what level is still unknown given uncertainties in just how strong wind speeds may get. At this time, Low risks are introduced back into forecast initially across the Plains and western Midwest tomorrow night into Sunday. Low risks continue through the extended portion of the forecast (into next Wednesday morning) as far north as central Minnesota and Wisconsin and east into Michigan and Ohio. The strength of southerly winds is still in question as the primary low pressure system is expected to be way north into Canada, and this may limit the pressure gradient (and resultant southerly wind speeds) between the low and high pressure in the eastern Midwest and Ohio/Tennessee River valleys by next week. Fresh market, processing, and late-planted field corn and other crop growers should monitor the forecast next week for the latest information. Growers all across especially the upper Midwest should continue to monitor for second generation and migration moth flights from last week as counts are rather high in some areas right now.