Control and management of mosquito population has become all the more difficult due to the development of resistance in mosquitoes to several chemical insecticides which are continuously used in vector control programmes. Plant derived compounds are often considered as effective alternatives against mosquitoes in order to reduce the environmental impact caused by the extensive use of synthetic insecticides. The Knockdown effect and repellent activity of essential oils derived from three plants, Melaleuca leucadendra (L.) L., Callistemon citrinus Curtis and Aegle marmelos (L.) Corrêa) were investigated in the present study. Observations showed that essential oils from all the tested plants exhibited considerable knockdown effect on Cx. quinquefasciatus. In addition to this, all plant derived essential oils showed repellent activity which was significant in all concentrations. It is observed that essential oils derived from M. leucadendra was found to be possessing very good repellent activity and provided complete protection for six hours.