The present study aimed to find the toxicity of aqueous and methanol extracts three different brown macroalgae viz., Padina tetrastromatica, Sargassum wightii Turbinaria conoides against tobacco cutworm, Spodoptera litura. Larval mortality was noticed in both at all concentrations tested a dose-dependent increase after 96 h exposure with 73.33, 56.66, 50.00 per cent extract; 50.00, 46.66 43.33 ...