Mosquitocidal activities of indian medicinal plant pavonia odorata willd (malvaceae) against selected vector mosquitoes (diptera: culicidae)

To determine the larvicidal and repellent activities of benzene and methanol extract of Pavonia odorata against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus Twenty five 3rd instar larvae of selected mosquitoes species were exposed to various concentrations (60-300ppm) and were assayed in the laboratory by using the protocol of WHO 2005; the 24 h LC50 values of the P. odorata leaf extract was determined following Probit analysis. The repellent efficacy was determined against selected mosquitoes at three concentrations viz., 1.0, 2.0 and 3.0 mg/cm2 under the laboratory conditions. The LC50 and LC90 values of benzene and methanol extract of P. odorata against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus larvae in 24 h were 78.52, 82.58, 88.32, 64.14, 58.22, 52.35 and 254.53, 261.82, 273.44, 242.46, 239.82 and 230.56ppm, respectively. In repelent activity, amoung two extrcts tested P. odorata methanol extract had strong repellent action against selected mosquitoes as it provided 100% protection against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus for 280min. From the results it can be concluded the P. odorata extract was an excellent potential for controlling Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus mosquitoes