Evaluation of the Residual Activity of Demon Ec, Dursban Lo and Tralomethrin Ec on Various Surfaces Against German Cockroaches and Brown Dog Ticks, 1988

Abstract

Abstract Unpainted and varnished birch wood panels, vinyl floor tiles and glazed ceramic tiles, measuring 232 cm2, were treated with either 0.015, 0.03 or 0.06% tralomethrin EC (3.75% AI); 0.1% Demon EC (25.3% AI); or 0.5% Dursban LO (41.5% AI). Each insecticide was applied at the rate of 3.8 liters/92.9 m2 using a pressurized 3.8 liter stainless steel hand sprayer calibrated to deliver 7 ml/ s at 20 psi with a 12 × teejet brass cone nozzle. After treatment, each panel was allowed to dry for ca. 30 min. At which time 10 adult brown dog ticks (sex ratio 1:1) were placed onto the treated surface and covered with a screened Fonda° paper can lid (8.9 cm diam). In a second test 15 adult German cockroaches (sex ratio 1:1) were similarly confined onto a separate series of glazed ceramic and plain birch wood panels which had been treated in a similar fashion with the same insecticides as above. While the same insecticides were used, only the 0.015 and 0.03% concentrations of tralomethrin EC were tested. In both tests, panels of each surface treated with water only served as controls. Treatments and controls were replicated 4 times/test interval. All insecticides were evaluated on the d of treatment (wk 0) and at 1, 2, 4, 8 and 12 wk post-treatment. The percentage of knocked-down and dead individuals was separately recorded 24 h after exposure. Those individuals which were unable to remain upright but were still able to move an appendage when probed with a teasing needle were recorded as knocked-down. No knockdown or mortality occurred on control panels for both species. All data were subjected to ANOVA, following arcsine transformation of the data. Original means are presented.