Indian Journal of Science and Technology
DOI: 10.17485/ijst/2009/v2i12.13
Year: 2009, Volume: 2, Issue: 12, Pages: 46-49
Original Article
K. Balaraju, R. Maheswaran, P. Agastian1 and S. Ignacimuthu
Entomology Research Institute, Loyola College, Chennai-600 034, India.
1Department of Plant Biology and Biotechnology, School of Life Sciences, Loyola College, Chennai-600 034, India.
*Author for the correspondence:
S. Ignacimuthu
Entomology Research Institute, Loyola College, Chennai-600 034, India.
E-mail:. [email protected]
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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