Abstract
Small single-wall bags made from kraft paper coated with carbaryl alone or combined with sesamex were exposed for 18 months to heavy populations of stored-product insects to determine the effectiveness of the coating in preventing insect penetration of the coated bags. All bags were filled with flour. Carbaryl deposits of 6.04 and 10.77 mg per m2 and the standard coating containing 0.47 mg per m2 of pyrethrins and 4.73 mg per m2 of piperonyl but oxide prevented insect penetration for 18 months. Carbaryl alone at about 1 mg per m2, sesamex alone at about 10 mg per m2, combinations of the two, and Celite 209 all failed to protect the bags from penetration.

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