Journal of Environmental Biology

Larvicidal activity of neem and karanja oil cakes against mosquito vectors, Culex quinquefasciatus (Say), Aedes aegypti (L.) and Anopheles stephensi (L.)

R. Shanmugasundaram, T. Jeyalakshmi, M.Sunil Dutt and P. Balakrishna Murthy*

International Institute of Biotechnology and Toxicology, Padappai, Kancheepuram - 601 301,  India

(Received: March 03, 2006 ; Revised received: November 10,2006 ;  Accepted: December 03, 2006)

Abstract: Larvicidal effect of neem (Azadirachta indica) and karanja (Pongamia glabra) oil cakes (individuals and combination) was studied against mosquito species. Both the oil cakes showed larvicidal activity against the mosquito species tested. The combination of neem and karanja oil cakes in equal proportion proved to have better effect than the individual treatments. The combination of the two oil cakes recorded an LC₉₅ of 0.93, 0.54 and 0.77% against the mosquitoes, Culex quinquefasciatus, Aedes aegypti and Anopheles stephensi respectively. The increase in efficacy of the combination treatment over individuals in all the mosquito larvae tested was found to range about 4 to 10 fold in terms of LC₅₀ and 2 to 6 fold in terms of LC_95.

 

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