Insect Alert For

Corn Earworm

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Alert Details

A rather strong late summer/early fall storm system is expected to impact the corn-growing region over the next week. Low pressure is expected to continue developing in the northern Plains while high pressure moves slowly from the central/eastern corn-growing region into the eastern United States by this weekend. The overall pattern is favorable for corn earworm migration, and with several days of south to southwest winds expected over the same areas, at least isolated moth flights may occur. Low risks are initially predicted mainly west of the Mississippi River tonight into tomorrow, with the risk then expanding east as far as southwest lower Michigan into northern Indiana tomorrow night into Friday as high pressure moves a little further east. Over the weekend and into early next week, fields from eastern Nebraska, Iowa, and south central/southeast Minnesota all the way east into southern Ontario, Canada and Ohio are at risk of seeing new moth flights. At this point in the growing season, we are most concerned with processing and fresh market growers, and these growers should continue regular trapping and scouting until harvest. A possible late-season risk upgrade is being considered for this weekend given such a favorable weather pattern expected at that time.