Evaluation of Residual Spray Treatments with Insecticides, 1983

An aluminum surface laminated to kraft paper cut into 1 ft2 sheets was fastened to masonite panels of the same size with double-stick tape. The aluminum surface was sprayed to the point of runoff with each of three concentrations of each insecticide tested. Each emulsion spray treatment was replicated three times for exposure to each species of laboratory-reared insect tested. After spraying with a small paint sprayer with pressure controlled at 20 lb/in2 panels were held 24 h before exposing the treated surfaces to insects. Mature larvae of the black carpet beetle, the warehouse beetle, and Troqoderma inclusum were held on treated surfaces for 24 h before they were moved to untreated containers with food; mortalities were recorded 7 days after initial exposure. All adult beetles and moths were exposed to treated surfaces 4 h, then removed and held an additional 20 h before recording mortality of test insects. Twenty specimens of each species were exposed to aluminum surfaces of three treatment replicates. Beetles were kept on treated areas by enclosing them in fluon-painted 7.5-cm diam glass cylinders capped with a filter paper cover when needed to prevent escape by flying insects. Ventilated bags were formed from paper-backed aluminum with the treated surface inside to hold moths. All tests were made in a room maintained at 80°F and 50-60% RH. The only difference between procedures followed by Groups 1 and 2 was that work on Group 2 was done after Group 1 was completed.