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Field-collected Culicoides oxystoma adults were exposed to different concentrations of commercial insecticides including chlorpyrifos,DDVP,deltamethyrin,beta-cypermethrin and beta-cypermethrin·emamectin benzoate via filter paper method,to determine toxicity of different insecticides on C. oxystoma.Results showed that toxicities varied significantly among insecticides. Biting midges were the most susceptible to deltamethyrin( 0. 060 mg/L),followed by chlorpyrifos( 0. 588 mg/L),beta-cypermethrin( 1. 741 mg/L),beta-cypermethrin·emamectin benzoate( 99. 670 mg/L),and DDVP( 600. 496 mg/L). After exposed to insecticides for 1 h,tested midges were transferred to recovery chamber and observed for another 24 h; increased mortality within this period was different under different concentrations of each insecticide. Relative toxicity index of deltamethrin was maximal when used as the standard reagent.
Field-collected Culicoides oxystoma adults were exposed to different concentrations of commercial insecticides including chlorpyrifos, DDVP, deltamethyrin, beta-cypermethrin and beta-cypermethrin · emamectin benzoate via filter paper method, to determine toxicity of different insecticides on C. oxystoma. Results indicate that that toxicities of various among among insecticides. Biting midges were the most susceptible to deltamethyrin (0.060 mg / L), followed by chlorpyrifos (0. 588 mg / L), beta-cypermethrin After exposure to insecticides for 1 h, tested midges were transferred to recovery chamber and observed for another 24 h; increased markers within this period was different under different concentrations of each insecticide. Relative toxicity index of deltamethrin was maximal when used as the standard reagent.