author(s)
Jayapriya G and Gricilda Shoba F

abstract
To determine the adulticidal and repellent activities of different solvent leaf extracts of Rhinacanthus nasutus against Aedes aegypti and Culex quinquefasciatus. The Adulticidal efficacy of the leaf extracts of Rhinacanthus nasutus with four different solvents they are petroleum ether, ethyl acetate, chloroform and methanol and were tested against the five to six days old adult female mosquitoes of Aedes aegypti and Culex quinquefasciatus. The adult mortality was observed after 24h. The repellent efficacy was determined against Aedes aegypti, Culex quinquefasciatus at three different concentrations viz., 1.0, 2.5 and 5.0 mg/cm2. Among the tested solvents the maximum efficacy was observed in the methanol extract. The LC50 and LC90 values of Rhinacanthus nasutus against adults of Aedes aegypti and Culex quinquefasciatus were 69.27, 73.47 ppm and 138.49 and 145.57 ppm respectively. Methanol extract of Rhinacanthus nasutus leaf extract produced maximum repellency in all the concentrations against two mosquito species at 240 min. The result concludes that Rhinacanthus nasutus serves as a potential agent for controlling Aedes aegypti and Culex quinquefasciatus.