10.22376/ijpbs.2019.10.1.p1-12 Volume 5 Issue 4 2014 (October - December) The larvicidal activities to determine the efficacies of acetone, ethyl acetate, chloroform and butanol dried leaf extracts of lessThan i greaterThan Annona squamosa lessThan /i greaterThan lessThan i greaterThan , lessThan /i greaterThan lessThan i greaterThan Cynodon dactylon lessThan /i greaterThan lessThan i greaterThan , lessThan /i greaterThan lessThan i greaterThan Melia azedarach lessThan /i greaterThan lessThan i greaterThan and lessThan /i greaterThan lessThan i greaterThan root extract of lessThan /i greaterThan lessThan i greaterThan Hemidesmus indicus lessThan /i greaterThan tested against 3 lessThan sup greaterThan rd lessThan /sup greaterThan instar lessThan i greaterThan Culex quinquefasciatus lessThan /i greaterThan  and lessThan i greaterThan Aedes aegypti lessThan /i greaterThan . The highest larvae mortality was found in the acetone followed by ethyl acetate, chloroform and butanol extract of lessThan i greaterThan A. squamosa lessThan /i greaterThan with LC lessThan sub greaterThan 50 lessThan /sub greaterThan values of 594.60, 490.35, 143.90, 117.98 and 280.62, 343.89, 156.92, 471.94 ppm; lessThan i greaterThan C. dactylon lessThan /i greaterThan with LC lessThan sub greaterThan 50 lessThan /sub greaterThan values of 585.86, 143.32, 74.33, 148.65 and 408.48, 198.43, 169.28, 385.55 ppm; lessThan i greaterThan M. azedarach lessThan /i greaterThan with LC lessThan sub greaterThan 50 lessThan /sub greaterThan values of 264.87, 65.27, 88.39, 514.65 and 192.78, 148.65, 172.24, 235.97 ppm lessThan i greaterThan H. indicus lessThan /i greaterThan with LC lessThan sub greaterThan 50 lessThan /sub greaterThan values of 210.22, 174.82, 117.98, 445.45 and 363.91, 255.47, 186.61, 338.56 ppm against lessThan i greaterThan C lessThan /i greaterThan . lessThan i greaterThan quinquefasciatus lessThan /i greaterThan and lessThan i greaterThan A lessThan /i greaterThan . lessThan i greaterThan aegypti lessThan /i greaterThan . Our result suggested that the ethyl acetate of lessThan i greaterThan M lessThan /i greaterThan . lessThan i greaterThan azedarach lessThan /i greaterThan leaf extract was an excellent larvicidal potential in controlling lessThan i greaterThan filariasis lessThan /i greaterThan and dengue vectors. RAVICHANDRAN RAMANIBAI AND KANAYAIRAM VELAYUTHAM Medicinal plants, Culex quinquefasciatus, Aedes aegypti, Lethal concentration 707-715