Tuesday, September 13th 2011 — Corn Earworm

2011_9_13_CEW_day1
Red: high risk, Yellow: moderate risk, Green: low risk, Brown: insect source region
How to Read the Maps

With unfavorable wind directions in place, no corn earworm migration risk is predicted the next two days.

Low migration risks return by Thursday night and Friday morning and continue through the weekend as the next weather system develops in the northern Rockies and southern Canada. Southerly winds will initially return to the Plains and western Midwest before spreading east through much of the corn-growing region throughout the weekend. Migration risks extend as far east as the Indiana/Ohio border and into central lower Michigan by Saturday night. Insect migration concerns are the greatest in the upper Midwest and Great Lakes region where some crops may still be susceptible to damage on an isolated basis.

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Corn Earworm

CEW thumb

Corn Earworm (Helicoverpa zea) Corn earworm is found throughout North America except for northern Canada and Alaska. Normally, corn earworm does not overwinter successfully in the northeastern United States. It is known to survive as far north as about 40…

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