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Map of Ostrinia nubilalis sample collection sites from infested regions of North America. Approximate geographic region of sympatric E- and Z-race populations that use a pheromone blend of predominantly E- or Z-Δ11-tetradecenyl acetate, respectively, are indicated by the shaded area along the East Coast of the United States. Locations 1 to 5 are in geographic regions where historically only the Z-race has been found, whereas locations 6 to 19 are in regions of sympatry.
