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Evaluation of Permethrin as an Insect-Resistant Treatment on Paper Bags and of Tricalcium Phosphate as a Suppressant of Stored-Product Insects

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Long-term warehouse tests in Egypt and simulated warehouse tests in the United States were conducted to determine the insect resistance of permethrin-treated, pyrethrins-treated, and untreated, multiwall paper bags. The bags contained a high-protein, blended cereal (ICSM) fortified with either tricalcium phosphate (TCP), an insect suppressant, or a combination of calcium phosphate and calcium carbonate (Ca). During 12 months of storage in Egypt, fewer permethrin-treated bags were infested (10.2–16.0%) than pyrethrins-treated bags (22.4–41.7%) or untreated bags (41.4–48.7%). Similar results were obtained in simulated warehouse tests. TCP was less effective than the treated bags and decreased the quantity of ICSM containing excessive populations (> 1,000 insects per bag) by ca. 7.72% compared with ICSM with Ca. A grease-proof paper barrier prevented movement of permethrin into the ICSM in bags stored for 28 months. During 1 year of storage, permethrin at up to 0.72 ppm was found in the ICSM in bags without a barrier ply. During 1 year of storage, there was little loss of permethrin from the outer treated ply of empty bags with or without a grease-proof barrier ply.

Document Type: Research Article

Publication date: February 1, 1984

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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