International Journal of Pure and Applied Sciences, Vol 1, No 3 (2007)

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Ovicidal activity of Neem (Azadirachta indica A. Juss) seed kernels extracted with organic solvents and distilled water on Aedes aegypti eggs

A. Umar, S. L. Kela, J. A. Ogidi

Abstract


The ovicidal activity of Neem (Azadirachta indica) seed kernels extracted with hexane, benzene, ethyl acetate, acetone, DMSO, 2-propanol, ethanol, methanol, distilled water and untreated control were evaluated on Aedes aegypti eggs. The results indicated lower and dose-dependant ovicidal activities in all treatments. At the lower concentration of 0.005% 2-propanol, hexane, ethanol and methanol extracted neem seed kernel gave 7.23%, 5.69%, and 3.27% and 1.52% inhibitions against hatching. At the higher tested concentration of 0.2% neem seed kernels extracted with hexane, acetone and 2-propanol gave 9.94%, 12.87%, and 12.73% inhibitions against hatching of A. aegypti eggs. The present study revealed that neem seed kernel extracted with these organic solvents and distilled water have lower ovicidal activity at the tested dosages, thus their use in ovicidal mosquito control is not effective. Future studies on the ovicidal activity of neem seed kernels extracted with these organic solvents and distilled water would focus on higher dosages to achieve meaningful ovicidal mosquito control.

Keywords: Azadirachta indica, Aedes aegypti, ovicidal activity

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