10.22376/ijpbs.2019.10.1.p1-12 Volume 3 Issue 3 2012 (July - September) Formulating phytochemicals in lieu of the synthetic ones for the control of mosquito menace is the imminent need of the day. Hence an investigation was carried out to explore the activity of different extracts of lessThan i greaterThan Gliricidia sepium lessThan /i greaterThan against fourth instar larvae of lessThan i greaterThan Culex quinquefasciatus lessThan /i greaterThan . The larval mortality was observed after 24 h of exposure. All the extracts showed moderate larvicidal effects; however the highest larval mortality was found in petroleum ether extract (LC lessThan sub greaterThan 50 lessThan /sub greaterThan = 61 ppm).This has revealed the presence of highly potential ergastic materials in lessThan i greaterThan Gliricidia sepium lessThan /i greaterThan which can be exploited for increasing the mortality rate in mosquito larvae. As the source plant is very common and the formulation is not costly, the present study may open new vistas towards finding out an environmentally safe and effective larvicide of the mosquito. Further this could boost up amelioration of the mosquito menace which is very acute in South India. Jiji Thomas,Shonima Govindan M,Muraleedharakurup G Phytochemicals, Larvicide, Mosquito, Culex, Gliricidia 614-618