Mosquitos are vectors for various diseases including Malaria, Dengue, Yellow fever, Filariasis, Japanese encephalitis and Chickungunya. Dengue is the most extensively spread mosquito-borne disease, transmitted by infected mosquitoes of Aedes species. Harmful effects of using synthetic chemical insecticides in mosquito control including vector resistance, environmental pollution and health hazards have initiated the current significance in the search for plant-based insecticide products that are environmentally safe and effective to control mosquito. As a part of the program ethanolic extract of three plant species collected in the state of Tamil Nadu, India were tested for their larvicidal activity against the filarial vector Aedesaegypti. The result revealed that the plant extract from the bulb of Allium sativum, and leaves of Andrographispaniculata and Rutagravelons where promising larvicide to control mosquito larvae. Ethanolic extract showed the highest larvicidal activity at the ratio of 1:1:1, 1:4:10, 3:2:1. The result reported in the present study open up the possibility of further investigations on evaluation, identification and isolation of the bioactive components of these plant extracts and its systematic effects on target mosquitoes, which would eventually facilitate the application of the extract as larvicides to control mosquitoes.
