Abstract
The present study was designed to evaluate adulticidal efficacy and repellency potentiality of crude and ethyl acetate extracts of mature fruits of Drypetes roxburghii (Wall.) Hurus., against the adult Culex quinquefasciatus Say and Anopheles stephensi Liston following appropriate protocols. In both the species of mosquitoes, mortality rate increased gradually with increased concentrations of ethyl acetate extract. LC 50 and LC 90 values of ethyl acetate extract were 109.62 ppm and 189.01 ppm for Cx. quinquefasciatus and 95.41 ppm, 181.96 ppm for An. stephensi respectively in adulticidal bioassay. An. stephensi was more susceptible to ethyl acetate extract than Cx. quinquefasciatus. Both crude and ethyl acetate extracts showed significant repellency potentiality. 99 % concentration of ethyl acetate extract conferred 100 % protection against biting activity of both the species of mosquitoes up to 120 minutes.
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