Study the affectivity of some commercial insecticides on larvae and pupae of mosquitoe’s Culex sp. at Basrah city

Abstract

Laboratory study was preformed to demonstrate the effectiveness of seven commercial insecticides from different manufactures and widespread in local markets on larvae and pupae of Culex sp. Four larval instars and pupae of the mosquito’s Culex sp. were chosen and collected from several ponds in Aljubaila and Garmat- Ali regions for applying this experiment. The larvae were exposed to three concentrations for each insecticide 250 , 500 , 1000 ppm ,the LT50 was calculated for each concentration of each insecticide , results showed that ElAskari insecticide is outdo another insecticides in killing by LT50 (7.49 , 12.88 , 19.63 ) for three concentrations respectively , and the insecticide with lower effectiveness was Flit Sole by LT50 ( 14.15 , 25.31 , 35.53 ) for three concentrations respectively. This study showed that insecticides which contain pyrethoids compound Tetramethrin in their structure are the most and preferred in houses because they have very low toxicity for mammals but they are highly toxic to insects and have a rapid knock- down effect even at very low doses .