Effect of Insecticide λ-Cyhalothrin on Different Stages of German Cockroach ,Blattella germanica (L.) and Brownbanded Cockroach Supella supellectilium (s.) (Dictyoptera: Blattellidae)

Abstract

Results of the effects of three different concentrations of the insecticide λ-Cyhalothrin against German cockroach Blattella germanica (L.) and Brownbanded cockroach Supella supellectilium (S.) showed that the mortality reached to 87.5, 73.61, 50% in case German cockroach exposed to 0.3, 0.15, 0.09mg/5g food respectively.It was also found that the effectiveness of these concentrations after 10 days on German cockroach varied from one stage of development to another, the gravid females were the least affected stage to the toxic baits used in this study. Results also showed that Sub lethal dose of 0.09mg/5g food caused decreases in the mean number of the hatching ootheca to 2.6 ootheca/female and decreases mean number of hatching nymphs per one ootheca to 9.33 nymph/ootheca Results also indicated that the concentrations of the same insecticide used against German cockroache had the samer efficacy on Brownbanded cockroach .