Department of Life Sciences, Dibrugarh University, Dibrugarh - 786004, Assam, (India).
1Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh - 786 004, Assam, (India).
Extracts of Pogostemon parviflorus, Pongamia glabra and Annona squamosa showed antifeedant activity against tea mosquito bug, Helopeltis theivora Waterhouse. The extracts of P. parviflorus possess highest antifeedant property. The antifeedant activity with petroleum ether and methanol extracts were less as compared to chloroform extracts. Fractionation of effective crude extracts of P. parviflorus by column chromatography revealed that the fraction No. IV (ethyl acetate/petroleum ether, 1:3) is most toxic against the pest.
