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Improving our Understanding of Helicoverpa zea Migration in the Midwest: Assessment of Source Populations

M. A. Sandstrom, D. Changnon, and B. R. Flood

July 2007

Review

Corn earworm (CEW) generally are not able to overwinter annually in the Upper Midwest, thus they must migrate northward to affect the primary vegetable-growing locations in this area. Migration of CEW is highly dependent on the weather. Favorable weather patterns for CEW migration and subsequent infestation of fields in north-central Illinois were confirmed by high CEW trap counts at Rochelle over the last four decades.

doi:10.1094/PHP-2007-0719-08-RV

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