Abstract
Abstract A test was conducted to evaluate 2 formulations of PP 321 (cyhalothrin 10 W and 12 WG). Three dose rates of each formulation were compared with Demon. The test surfaces consisted of 8- by 8- by one-quarter-inch unfinished plywood panels. The surfaces were treated with a modified B & G sprayer, model 104-S. The sprayer was mounted on a motorized track. A spraying system Multi Teejet fan nozzle 800067 was attached to the nozzle stand and transported on the track. The nozzle was set at a height of 12 inches above the panels. The nozzle delivered 2.2 oz of finished spray/100 ft2 at 20 psi. The application speed was 2.5 ft/s. The sprayer design, speed of delivery, and amount of liquid applied was set to duplicate field application. After spraying, the treated panels were allowed to dry for 24 h before the cockroaches were placed on the treated surface. Cockroach containment to the panel surface was accomplished by using PVC open-ended plastic cylinders (6¼-inch diam by 8 inches high). The cockroaches were exposed to 30.68 inch2 of treated surface. A mixture of petroleum jelly and mineral oil was applied to the container wall to keep the cockroaches on the treated surface. Nylon fabric was placed over the top of the containers to aid in the transfer of cockroaches from treated to untreated surfaces and to guard against escapes.
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