Efficiency of Euphorbia petiolata L extracts on immature stages of Culex pipiens molestus

Euphorbia petiolata L Culex pipiens molestus 50 100 150 200 200 79% 63% 45% 96 . 200 81% 67% 48 50 61 82 . .The effect of alcoholic extracts of Euphorbia petiolata (roots, shoots, leaves) on the larvae and pupae of Culex pipien molestus were investigated by using four concentrations of each extract (50, 100, 150,& 200) ppm. The leaves extract concentration at 200 ppm were more toxic to larvae in comparison with shoots and roots extracts. with mortality percentages were 79%, 63% and 45% respectively after 96 hours of treatment. Leaves and shoots extracts were more toxic to pupae than larave. at The applied concentration of 200ppm of leaves and shoots were caused mortality of treated pupae 81% and 67% respectively after 48 hours of treatment. The Lc50 of leaves and shoots were 61, 82 ppm respectively.On the other hand, roots extract was more effective on larave as compared to pupae at the same applied concentrations.