Studying the Effect of Some Drugs and Chemicals on the Pupae of Culex pipiens molestus Forskal ( Culicidae:Diptera)

In the current study, the effect of lethal concentrations of drug solutions and chemicals against pupae of Culex pipiens molestus mosquitoes was investigated after 24 hours and up to 3 days of the experiment using different concentrations. Regarding the drug solutions, the concentration of 100 ppm of the niclosamide drug solution showed a 100% lethal effect on the second day of the experiment, and the value of LC50 was 113.7 ppm. The concentration of 800 ppm of the sulfasalazine drug solution caused the death of all the pupa, with a death rate of 100% on the third day of the experiment, and the value of LC50 was 854.7 ppm. The concentration of 2000 ppm for both piperazine and isoniazid medicinal solutions caused a death rate of 100% on the second and third day of the experiment, respectively, and the LC50 value for both piperazine and isoniazid was 2220.7 and 2273.0 ppm, respectively. The concentration of 14,000 ppm of the drug solution 4-aminoantipyrine caused the death of all pupal mosquitoes on the second day of the experiment, and the value of LC50 was 14,360.0 ppm. As for solutions of chemicals, the concentration of 150 ppm of the chemical solution ethyl salicylate showed a lethal effect on all pupal mosquitoes, with a 100% death rate on the second day of the experiment, and the value of LC50 was 176.2 ppm. The death rate of mosquito pups reached 100% when using chemical solutions of thymol, sulfamic acid, sulfanilamide, and 2,6-dihydroxytoluene at concentrations of 240, 2000, 2500 and 10,000 ppm, respectively. The value of LC50 for each of thymol and sulfamic acid was, Sulfanilamide and 2,6-dihydroxytoluene 352.1, 2940.8, 2582.5 and 10750.0 ppm, respectively.