Insect Alert For

Corn Earworm

Risk Level:
Affected Area:
Full page
Alert Details

A rather potent low pressure system and attendant cold front is expected to move through the corn-growing region late in the weekend and into early next week. This system looks more impressive in the last day or so than at the beginning of the week, thus prospects for corn earworm migration are being increased as southerly winds may allow for at least isolated to scattered moth flights to occur. Low risks on increasing southerly winds are predicted mainly west of I-35 tonight into tomorrow morning, or from the Plains states into Minnesota, Iowa, and western Missouri. Low risks continue in the forecast tomorrow night into Sunday morning across the same region as Day 1 but also further east into Wisconsin and Illinois. By Sunday night into Monday, confidence has increased that a pretty good fetch of focused southerly winds should blow from near or in active source regions in the mid-south region northward into the upper Mississippi River valley. For this reason, Moderate migration risks are in the forecast from far eastern Nebraska into far southern Minnesota, Iowa, extreme northern Missouri, and into southern Wisconsin and northern Illinois. Low risks extend north to near the Minneapolis, MN region and east into the southern Great Lakes region mainly west of I-69. Low risks then follow in the forecast ahead of the cold front mainly east of I-57 next Monday night into Tuesday before northwest flow returns. Growers with crops at susceptible stages to damage, including fresh market and processing growers, should monitor traps and prepare for a potential moth flight on at least an isolated basis in the next several days as this weather system moves through.