Abstract
The present study aimed to study some alternatives chemicalpesticides and observation their effect on the life of the first and secondlarva instar of Culex pipiens pipiens L. for this reason, this species ofmosquitoes was raised in the breeding cage, which was locally produced.The plant extracts of the seeds of the Nigella sativa, Azadirachta indica,Sesbania sesban and Lagenaria vulgaris, the larvae of the first andsecond instar of mosquitoes were treated with plant extracts byconcentrations of 100, 500, 1000, 5000, ppm. The study showed differentresults according to the concentration and duration of treatment. Thetreatment with plant extracts showed that the Nigella sativa seed extractis higher than the rest of the plant extracts. The mortality percentage was93.3% in the concentration of 5000 ppm after 24 hours of treatment.Themortality percentage for the same extract was 100% at the concentrationof 5000 ppm within 48 hours of treatment for the first larval instar, whilethe mortality percentage for the extract were 100% at 5000ppmconcentration during 24 and 48 hours of treatment for the second larval
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