Differences in the Rapid Knockdown and Lethal Effects of Aerosol Formulations against German Cockroach (Blattaria, Blattellidae) Strains

Abstract

ABSTRACT The knockdown and lethal efficacies of five aerosol formulations including Combat Speed ® (AIs: 0.1 % imiprothrin and 0.3% cyphenothrin), Raid Power ® (AIs: 1.0% pyrethrin and 0.2% permethrin), Home Keeper ® , (AIs: 0.2% tetramethrin and 0.3% permethrin), Super Killer ® (AIs: 0.32% tetramethrin and 0.08% bioresmethrin), and Perma Kill‐K ® (AIs: 0.3% dichlorvos and 0.1% tetramethrin) against five strains of the German cockroach, Blattella germanica (L.) were assessed. The results show that the mean value of KT 50 (5.4 sec.) of Combat Speed ® was 4.5 and 3.1‐folds lower than those of Perma Kill‐K ® and Home Keeper ® , respectively. The mean value of KT 90 (9.0 sec; slope = 10.02) of Combat Speed ® was 3.8 to 5.8‐folds lower than Perma Kill‐K ® , Supper Killer ® and Home Keeper ® . As lethal effects, the mean value of LT 50 (17.3 sec.) of Combat Speed ® was over 26 folds lower than Supper Killer ® and Perma Kill‐K ® . The mean value of LT 90 (32.9 sec.) of Combat Speed ® was 37.4 and 15.1‐folds lower than those of Supper Killer ® and Perma Kill‐K ® , respectively. In general, Combat Speed ® and Raid Power ® were considered the insecticide aerosols with faster knockdown and higher lethal effects than Supper Killer ® , Perma Kill‐K ® , and Home Keeper ® against five strains of German cockroaches in Korea. Also, the knockdown and lethal effects of Supper Killer ® , Perma Kill‐K ® , and Home Keeper ® were highly variable depends on the strains.