A field experiment was laid out in a randomized block design at the College of Horticulture, University of Horticultural Sciences, Bagalkot, during 2013-14 to study the bio efficacy of different insecticides against Agrotis segetum (Denis and Schiffermuller) and Spoladea (=Hymenia) recurvalis (Fabricius) on amaranthus. The experiment consisted of ten treatments, among all the treatments the green labelled or newer molecules viz., emamectin benzoate 5 SG @ 0.25 g/l, indoxacarb 15.8 EC @ 0.25 ml/l and fipronil 5 SC @ 1 ml/l were found very effective in minimizing the larval population and superior in reducing foliage damage throughout the period of experiment and also fetched higher yields of 21.67, 21.49 and 20.67 t/ha. The highest incremental cost benefit ratio (93.33) was obtained from the treatment malathion 50 EC @ 2 ml/l.