Penetration of Various Packaging Films by Common Stored-Product Insects1

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Abstract
The resistance of various packaging films to penetration by common stored-product insects was tested by 2 methods, lard-can tests, and cup tests. In these tests 14 different packaging films were used and 11 species of insects, including the cadelle, confused flour beetle, drug-store beetle,dermestid beetle,German cockroach, granary weevil, Indian meal moth, lesser grain borer, Mediterranean flour moth, rice weevil and saw-toothed grain beetle. a nontransparent laminated film containing aluminum foil was relatively resistant to insect penetration but not insect proof. Cellophane films, both as single and laminated films, were readily penetrated by most insects. The resistance of polyethylene film to insect penetration varied directly with the film thickness. Of the insects tested, the lesser grain borer and cadelle appeared to be the best penetrators of packaging films and the saw-toothed grain beetle the least able to penetrate.

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