Antifeedant activity of aqueous leaf extracts of certain plants such as Cryptostegia grandiflora, Mansoa alliacea, Allamanda cathartica, Allamanda blanchetti and Xanthium strumarium and leaves of tree species such as Kigelia pinnata, Bauhinia Purpurea, Drypetes roxburghi, Conocarpus lancifolius and Polyalthia longifolia were studied against third instars of Spodoptera litura at different concentration (3%, 5% and 10%). The extract was prepared by drying the selected plant parts, powdered and soaked in water for 24 hrs. The third instars of S. litura were exposed to various concentrations and Percent antifeedant were recorded after 24hrs. The maximum leaf area protection was noticed in the aqueous extract of leaves (92.60%) in Xanthium strumarium @ 10% respectively. The minimum per cent antifeedancy was noticed in the treatment, Mansoa alliacea 10 % with 51.65 % antifeedancy. Results revealed that the antifeedancy was increased with increasing in concentration of the plant extracts.