Larvicidal Activity OF Azadirachta Indica ON Culex quinquefasciatus Say (Culicidae: Diptera) & Anopheles arabiensis Say (Culicidae: Diptera)

الملخص

ABSTRACT

The adverse effects of chemical insecticides-based intervention measures for the control of mosquito vectors have received wide public apprehension because of several problems like insecticide resistance, resurgence of pest species, environmental pollution, toxic hazards to humans, and non-target organisms. These problems have necessitated the need to explore and develop alternative strategies using eco-friendly, environmentally safe, bio-degradable plant products which are non-toxic to non-target organisms too. Therefore, it was aimed by this study to evaluate some extracts(acetone, chloroform, ethanol, ethyl acetate and water) prepared from plant(A. indica, (Neem)  under 6 concentrations (0.01,0.02,0.03,0.04,0.05 and0.1) as natural larvicides against 3rd instar larva of The different larval mortality were recorded after 24 hours. The tested plant extracts in their different concentrations have shown larvicidal effects on An. Arabiensis and C. quinquefasciatus larvae. The repellent action of the plant extracts tested varied depending on the plant species and solvent used in extraction and the extract dose. The ethanol extraction was more effective in exhibiting the repellent action against the An. Arabiensis and C. quinquefasciatus larvae as compared with acetone, chloroform , ethyl acetate and water extraction. followed by ethyl acetate , acetone, chloroform and water extraction respectively. Statistical analysis showed  significant differences between  concentration  of  plant  extracts and control .