Larvicidal activity of Ocimum sanctum Linn. (Labiatae) against Aedes aegypti (L.) and Culex quinquefasciatus (Say)

The acetone, chloroform, ethyl acetate, hexane, and methanol leaf and flower extracts of Ocimum sanctum were studied against fourth instar larvae of Aedes aegypti and Culex quinquefasciatus. The highest larval mortality was found in leaf extract of O. sanctum against the larvae of A. aegypti and C. quinquefasciatus. The LC₅₀ values of O. sanctum against the larvae of A. aegypti were 425.94, 150.40, 350.78, 575.26, and 175.67 and against the larvae of C. quinquefasciatus were 592.60, 93.92, 212.36, 76.61, and 82.12 ppm, respectively.