Present study revealed that ethanol extract of Carica papaya were found to be more larvicidal and fatal to mosquito larvae (Aedes aegypti). Aqueous leaf extract at lower concentration were also able to induce toxicity. Ethanol extract of Cereus pterogonus found to be moderately toxic to mosquito larvae. Aqueous extract of Cereus pterogonus shows a medium larvicidal activity against Aedes aegypti and was found to be increased with dose and time. The study disclosed the fact that phytochemicals present in both extracts has useful biological activities. Carica papaya shows more toxicity than Cereus pterogonus against Aedes larvae with respective to concentration and time. From the studies it is evident that Carica papaya and Cereuspterogonus possess some chemicals in their leaf extract which act as a regulator of growth of larvae to adult emergence
