Mortality Rate of Houseflies Exposed to some Selected Insecticides

Abstract

Houseflies are pest in homes, dairies, barns, poultry houses, recreation areas and food processing sites. The study is to evaluate the susceptibility of  Musca domestica to deltamethrin, cypermethrin and DDVP insecticides. Topical bioassay was used to perform adulticidal test, while dipping method was  used for larva and pupa, different concentrations were used which ranges from 0.5ml/L-10.0 ml/L for larvae and pupae while 5.0 µL/fly-50.0 µL/fly was  used for adult Musca domestica. The mortality of larvae on application of deltamethrin ranges between 23-53% (LC₅₀ 8.125 ml/L) cypermethrin ranges  between 29-76% (3.401 ml/L). DDVP ranges between 25-91% (LC₅₀ 2.36 ml/L). DDVP was more effective against larvae. The mortality of pupae on  application of Deltamethrin ranges between 70-97% (LC₅₀ 0.087 ml/L), cypermethrin ranges between 40-77% (LC₅₀ 1.186 ml/L) while DDVP ranges  between 43-83% (LC₅₀ 0.777 ml/L. Deltamethrin had better pupacidal activity compared to DDVP and cypermethrin. The mortality for deltamethrin  against adulticidal study ranges between 27-73% (LC₅₀ 14.626 µL/Fly) while cypermethrin had mortality of 23-77% (LC₅₀ 18.272 µL/Fly) and DDVP ranges  between 20-73% (LC₅₀ 19.182 µL/Fly), deltamethrin was more effective. Notable level of susceptibility of DDVP, cypermethrin and deltamethrin was found  in the present study, as deltamethrin, cypermethrin and DDVP were toxic to Musca domestica in a dose dependent manner.