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Abstract
Polymer films treated with permethrin or with chlorpyrifos-methyl were heat-shrunk around bundles of small bags containing cornmeal. The wraps treated with chlorpyrifos-methyl were either completely sealed or had open ends, while permethrin-treated wraps were completely sealed. During 12 months of exposure to large, mixed populations of stored-product insects, sealed wraps containing 203 mg/m2 of permethrin or 1,318 mg/m2 of chlorpyrifos-methyl significantly reduced the incidence of infestation. Sealed wraps containing 12 mg/m2 of permethrin or 377 mg/m2 of chlorpyrifos-methyl failed to provide adequate protection from infestation, as did sealed, untreated film wraps. Most of the bags in open-end bundles made of chlorpyrifosmethyl-treated film were infested at each periodic examination. The higher permethrin and chlorpyrifos-methyl treatments nearly prevented penetration of the film wraps by boring insects. The cornmeal in these wraps contained residues of between 0.29 and 1.25 ppm of permethrin or between 13.64 and 24.20 ppm of chlorpyrifos-methyl during 12 months of storage.
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