تقيم فاعلية مستخلصات الهكسان و خلات الاثيل لبعض المسخلصات النباتية في قتل يرقات بعوض Culex pipiens molestus Forskål

Abstract EN

Insecticides are the most effective methods using against mosquitoes insect especially when the diseases and epidemics is outbreaked , but from the ether side the insecticides are the most harms on environment especially when the larva of mosquitoes lived in aquatic environment, marshes and swamps where, many other organisms live.

Therefor the aim of this study is to evaluate the effect of eight of hexane and ethyalacetate extracts of species of Myrtus communis L.

(Yas in Arabic), Pluchea tomentosa DC.

(Kheais in Arabic),Pulicaria revularia (Shewaser in Arabic)and Ruta chalepensis L(Sethab in Arabic).

on the the 4th instar larvae of Culex pipiens molestus Forskål Results showed that the hexane and ethyalacetate extract of R.

chalepensis had the highest effect, the 50% concentration (LC50) for the larvae was 75 and 71 part per million (ppm) respectively after 48 hours of treatment followed by hexane extracts of P.

revularia , M.

communis and P.

tomentosa with LC50 ٢٣٦,560 ,and 640 ppm respectively after 48 hours of treatment.

then ethyalacetate extracts of same plant with LC50 7500, 9000, 1100 ppm respectively after 48 hours of treatment The hexane extracts were separated by thin layer chromatography (T.L.C) and detected of some secondary compound by colorings reagents.