Insect Alert For

Corn Earworm

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

The active weather pattern is expected to continue across the corn-growing region this week, with another weather system likely next weekend that may be very similar to the one that passed through the corn-growing region this past weekend. Despite what the calendar says, there are still crops at susceptible stages to damage from corn earworm especially in the northern portion of the corn-growing region, some due to late/re-plant but others intentionally planted late (especially processors). Given these factors, Low corn earworm migration risks are in the forecast late Thursday into Friday mainly from northern Iowa and Minnesota east into Wisconsin, northern Illinois, and also further east into southwest lower Michigan and northern Indiana. These risks are ahead of a developing low pressure system and attendant cold front in the Plains which will allow stout southerly winds to return to areas east of the front by late week. Short-distance corn earworm moth flights will be possible from source regions south of I-80 during this time. Low risks then continue further east across the southern Great Lakes region and eastern corn-growing region Friday night into Saturday as the front heads on southeast. Growers with crops still at susceptible stages to damage need to continue to check traps and scout fields given recent flights and the possibility for additional new moths to appear in the next week.