Vol. 3, Issue 4, Part A (2016)

Author(s): Rahana VK, Anju Viswan K and Pushpalatha E

Abstract: Development of resistance in mosquitoes against synthetic insecticides led to alternative control strategies. In the present study, three plant products from viz., Mimusops elengi (L.), Erythrina variegata (Linn.) and Pongamia pinnata (L.) were screened for their mosquitocidal activities. Twenty four hours LC₅₀ of the methanolic seed extracts of the selected plants against the 1^st, 2^nd, 3^rd and 4^th instar larvae of Aedes albopictus ranged from 11ppm to 232 ppm. Extension of larval duration was also observed as 13.00 and 17.33 days respectively for 1^st and 2^nd instars when compared to control, with 8.00days. It was found that at lower concentrations, there was an overall increase in the developmental periods (49.21days), however at higher treated concentrations an increased mortality rate was observed irrespective of the plants selected. The results obtained in the present study open the possibility for further investigations on the biochemical and physiological aspects of Insect Growth Regulatory (IGR) activities of these three plants against Aedes albopictus.

Related Graphics: Click here for more related graphics