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Evaluation of the Residual Life of Fenoxycarb on Various Surface Types, 1987


 Comparative tests were initiated to determine the efficacy and residual life of the juvenoid fenoxycarb (25.2% emusifiable concentrate) against the German cockroach when applied to a variety of surfaces. The surfaces evaluated in this test were tempered masonite hardboard, latex-painted (4 coats) plywood, vinyl floor tile, 1%-inch-thick concrete block, and unpolished stainless steel. Spray dilutions of 0.187% fenoxycarb were applied to 4- × 4-inch (103 cm2) panels of each surface at the rate of 1 gal/1000 sq ft (0.42 ml/103 cm2) using a mechanized spray tower apparatus equipped with a stainless steel nozzle tip, Spraying Systems Tee-Jet 8001E, at a constant pressure of 25 psi. After treatment, panels were placed into vertical storage compartments for residual aging. Aging periods evaluated were 1 day; 1 wk; and 1, 2, 3, 4.5, and 6 mo. The test insects were reared in 7- × 5- × 3.5-inch plastic boxes that had sides lightly greased with a petrolatum-mineral oil mixture. The boxes were equipped with ventilated, friction fitted lids to prevent escape of the insects. A fenoxycarb-treated panel was placed on the bottom at one end of the box with food and water positioned on top of the treated panel. A 20-sq-inch cardboard tent, placed at the other end of the box, served as harborage. This design offered the test insects a choice of harborage areas, but assured exposure to fenoxycarb during daily food and water consumption. At each aging period, 20 early 5th-stage nymphs were released into the confinement with the appropriate panel type. The insects were maintained here until they reached adulthood or died. Each aging period and panel type combination was replicated 4 times, for a total of 80 insects per treatment combination. Response variables evaluated in this study were the percent of surviving adults showing the morphogenetic deformities (wing twisting) associated with exposure to a juvenoid and the severity of wing twisting (TW) as rated on a scale from 0 (unaffected) to 5 (severely affected).