author(s)
Govindan Sivaraman, Appadurai Daniel Reegan, Michael Gabriel Paulraj and Savarimuthu Ignacimuthu

abstract
The present study was conducted to evaluate the larvicidal and ovicidal activities of various extracts of Semecarpus anacardium seeds against Culex quinquefasciatus Say and Aedes aegypti L. mosquitoes. This experiment was carried out at Entomology Research Institute, during the year 2015-2016. Extracts were prepared different concentrations at 62.5, 125, 250 and 500 ppm using acetone for larvicidal and ovicidal activities. The lethal concentration (LC) values were calculated by probit analysis software (SPSS 11.5 version). The ovicidal activity results were analyzed using the Graph Pad Prism 5.0. After 24 h of treatment the hexane extract showed the highest larvicidal activity with LC₅₀ and LC₉₀ values of 36.75, 234.057 ppm and 48.88, 299.56 ppm concentrations against the larvae of Cx. quinquefasciaus and Ae. aegypti, respectively. Similarly the same hexane extract showed 94.97% and 83.92% ovicidal activity at 500 ppm concentration after 120 h post treatment. The result clearly indicates that hexane extract of S. anacardium seed could be used to control these vector mosquitoes.