Toxicological and Residual Effects of (Deltamethrin) and (Chlorpyrifos)
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Toxicological and Residual Effects of (Deltamethrin) and (Chlorpyrifos)
The toxicological and residual properties of two insecticidal agents, Deltamethrin and Chlorpyrifos were evaluated against the German cockroach, Blatella ...
Toxicological and residual effect of Deltamethrin and Chlorpyrifos against the German cockroach, Blattella germanica (Linnaeus) (Insecta: Blattodea: Blattellidae) Kemabonta, K. A.*, Ohadiwe, A. and Adetoro, F. A. Department of Zoology, Faculty of Science, University of Lagos, Akoka, Lagos, Lagos State, Nigeria. Received 15 June 2014; Accepted 25 June 2014
The toxicological and residual properties of two insecticidal agents, Deltamethrin and Chlorpyrifos were evaluated against the German cockroach, Blatella germanica in laboratory bioassay. The insecticides were diluted in both aqueous and oil-based solvents and tested against the roaches in pre-determined concentrations and untreated control. Experimental cages were either completely sealed after exposure or perforated to simulate fumigation and disinfestation regimes, respectively. Mortality data generated from acute toxicity studies revealed that oil-based Deltamethrin (5%v/v) was more effective (100%) than aqueous solution (53.3%) within similar durations in both chambers. Chlorpyrifos (5%v/v) revealed an acute mortality of 100% for both oil-based and aqueous solutions in both chambers. Residual effect of both Deltamethrin and Chlorpyrifos was dose/time-dependent, with oil-based solution more effective than the aqueous solution. Computed lethal time revealed that LT50 showed significant difference (P
