Efficacy of Chlorpyrifos and Bacillus Thuranginsis Israelinsis against Culex Pipiens (L.)

Culex pipiens (L.) (Diptera: Culicidae) is the most important medical insect in many parts of world. Biological and natural chemicals have advantages over traditional ones case mosquito control. The efficacy two insecticides belonging to different groups chlorpyrifos-ethyle (oranophosphate) Bacillus thuranginsis var israelinsis) (bio-insecticides)were evaluated against field laboratory individuals late 3rd instar larvae at concentrations three periods exposure under conditions. Results obtained showed that strain higher susceptibility tested than populations collected from Abo-Rewash City, Giza Governorate mortality percentage was increased gradually with increasing insecticide significant differences between Also, activity acetyl cholinesterase (AChE), glutathione S- transferase (GST), Total proteins activities both Aspartate aminotransferase AST(GOT) Alanine ALT(GPT) were determined after 72 hrs insecticidal exposure.