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Abstract : |
The chloroform extract and its isolated pure compound NCS-2 from the flowers of Nyctanthes arbor-tristis L. were evaluated for larvicidal activity against common filaria vector, Culex quinquefasciatus Say at different instar under laboratory conditions. The LC50 values for the chloroform extract were 25.67, 22.19; 38.60, 28.95; 53.14, 42.14 and 72.60, 61.82 ppm and for the isolated compound NCS-2 were 73.31, 65.48; 83.02, 67.02; 97.26, 81.84 and 114.68, 99.02 ppm for 1st, 2nd, 3rd and 4th instar larvae respectively at 24 and 48 hours post exposure. The results also showed that the late instar larvae were more resistant to the extract than those of early instars., |
