10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 3 2015 (July - September) After prolonged use of the synthetic insecticides, novel insecticides of botanical origin are preferred for environment safety as well as human life. Present study was conducted to evaluate the larvicidal capability of lessThan i greaterThan Capparis zeylanica lessThan /i greaterThan against lessThan i greaterThan Culex quinquefasciatus. lessThan /i greaterThan Crude, cold and hot aqueous and ethyl acetate solvent extracts of foliages of lessThan i greaterThan C. zeylanica lessThan /i greaterThan were tested against all instars larvae of lessThan i greaterThan Cx. quinquefasciatus. lessThan /i greaterThan Lethal concentrations were determined. Effect on the non target water fauna was also tested. Cent percent mortality was found with 0.25% concentration of crude extracts against 1 lessThan sup greaterThan st lessThan /sup greaterThan and 2 lessThan sup greaterThan nd lessThan /sup greaterThan instar larvae. No larvicidal responses were found with cold and hot aqueous extracts. Highest mortality was found against 1 lessThan sup greaterThan st lessThan /sup greaterThan and 2 lessThan sup greaterThan nd lessThan /sup greaterThan instar larvae at 90 ppm concentration of ethyl acetate extracts at 72 h post exposure. Non-target populations were found non-responsive to active fraction. Secondary metabolites like Tannin, flavonoids and terpenoid were detected through preliminary qualitative phytochemical tests. ANUSHREE SINGHA RAY, KUNTAL BHATTACHARYAAND GOUTAM CHANDRA Capparis zeylanica, Culex quinquefasciatus, Non-target organisms, Larvicide. 139-148