Response on growth regulatory activity of three indigenous plant extracts against dengue vector Aedes albopictus (Skuse)

Authors: Rahana VK, Anju Viswan K and Pushpalatha E
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 1st, 2nd, 3rd and 4th 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 1st and 2nd 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.

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