Insect Alert For

Corn Earworm

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Alert Details

Corn earworm migration risks will be on the increase across an increasingly large portion of the corn-growing region as we head into the upcoming weekend. A heat dome is likely to continue spreading north and east from the Plains into the northern and central corn-growing region over the next couple of days. South to southwest winds will be present within the heat dome, and along the leading edge of the heat thunderstorms are likely to continue as they have for the past several days which could also serve as locations for isolated moth flights to drop out. Corn earworm migration risks will initially be in the Low category and mainly west of I-57 in eastern Illinois for the next couple nights as winds will not be originating from optimal source regions in the southern Plains, but eventually Moderate risks enter the forecast by Friday night into Saturday morning from far northeast Kansas and Nebraska north and east into northern Missouri, Iowa, far western Illinois, southeast South Dakota, central and southern Minnesota, and southwest Wisconsin. As a cold front pushes southeast, Moderate risks continue in the forecast Saturday night into Sunday morning mainly east of a line from Topeka, Kansas to Minneapolis, Minnesota into northwest Indiana and southwest lower Michigan. The Moderate risk continues along and ahead of the cold front Sunday night into Monday morning for areas mainly along and east of I-57 from far eastern Illinois into Indiana, Ohio, lower Michigan, and also into southwest Ontario, Canada. Growers with crops at susceptible stages to damage are encouraged to monitor for new moth flights through the upcoming weekend and take appropriate action when and where needed.