Abstract
Abstract Two formulations of Orthene were investigated, CC-6109 (2.5E) and CC-4233 (85S). The 2.5E formulation was applied as a 1.0 and 0.75% spray whereas the 85S was applied only as a 1.0% spray. A Dursban 2E (0.25%) and Vaponite 2E (0.25%) standard was used for comparative purposes. Masonite panels cut to 1 ft2 (929 cm2) were treated and used as exposure surfaces. A spray apparatus (tower) equipped with a conveyor belt was used to apply the pesticide to insure uniform distribution on the panels. A stainless steel nozzle, Spraying Systems Tee-jet 8001, was used during application. The tower was calibrated such that the material was applied at the rate of 1 gal/1000 ft2 (3.78 ml/929 cm2). Freshly sprayed panels were placed in residual aging compartments until the time of their use. Bioassasys were conducted at 30 sec, 5 min, 30 min, 6 h, and 24 h. Test insects were exposed to panels aged 1 day, 1 week, and 1 month. After exposure, insects were removed from the treated surface and held in untreated containers for 48 h. Food and water were provided during the 48 h evaluation period. Mortality counts were made at 24 and 48 h. Abbott’s formula was used to determine the percent mortality for all replications. A total of five replications was used for each exposure period. Each replication consisted of 10 cockroaches, 5 males, and 5 females.
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