• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2009, Volume: 2, Issue: 12, Pages: 46-49

Original Article

Egg hatchability and larvicidal activity of Swertia chirata Buch. - Hams. ex Wall. against Aedes aegypti L. and Culex quinquefasciatus Say.


Crude Swertia chirata extracts (hexane, ethyl acetate & methanol) were tested for egg hatchability and larvicidal activity against two vector mosquitoes, Aedes aegypti and Culex quinquefasciatus. The lowest egg hatchability was recorded at 1000 ppm of ethyl acetate extract which showed 12.6, 20.4 and 25.4 % at 0-6, 6-12 and 12-18 h respectively against Cx. quinquefasciatus; it was 11.4, 17.8 and 23.4 % at 0-6, 6-12 and 12-18 h respectively against Ae. aegypti. The LC50 values for the larvicidal activity of ethyl acetate extract of S. chirata against first, second, third and fourth instar larvae of Cx. quinquefasciatus were 164.91, 220.10, 284.05 and 326.46 ppm and against Ae. aegypti 192.67, 237.30, 339.06 and 329.29 ppm respectively.

Keywords: Swertia chirata, Culex quinquefasciatus, Aedes aegypti, egg hatchability, larvicidal activity 


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