Physical and Chemical Factors of Breeding Sites Affecting Susceptibility and Biochemical Activity of Mosquito, Culex pipiens (Diptera: Culicidae) to Some Insecticides

Culex pipiens is the common mosquito in Egypt and worldwide species. There is limited evidence on the effects of breeding place nature on the susceptibility of Cx. pipiens to different insecticides. This study aims to evaluate the effects of some physiochemical parameters of different breeding sites in Egypt on Cx. pipiens susceptibility to some recommended insecticides. Mosquito larvae were collected from fresh and sewage water from the selected sites at different areas in Egypt. Water was analyzed in the laboratory to determine salinity and pH. Bioassays and biochemical assays were carried out to determine susceptibility of both larvae and adult under different physiochemical parameters. Larvae and adult that were collected from sewage water with high salinity and acidic medium showed higher resistant to all tested insecticides than those of fresh water with low salinity. The present study provided information of the susceptibility of Cx. pipiens mosquito larvae and adult to some insecticides commonly used under different environmental changes