The experiment was carried out at Research farm of BTC CARS, Bilaspur during Rabi 2019-20. A field experiment was laid down in randomized block design (RBD) and replicated thrice with six bio-pesticides, botanicals, one insecticide and untreated control. The treatment Imidacloprid 17.8 SL @ 0.2ml/liter was found to be most effective treatment against mustard aphid, recorded least over all mean population (15.74 aphid/plant) with maximum per cent reduction in aphid population (88.72%) and benefit cost ratio 3.35:1 followed by Garlic extract 5% with over all mean aphid population (21. 24 aphids/plant), per cent reduction (84.87%) and benefit cost ratio 2.68:1. Other treatments in decreasing order of their efficacy were Lecanicillium lecanii10.00% WP, Aak leaf extract 5% Beauveria bassiana 10.00% WP, Aak flower extract 5% and Metarhizium anisopliae 10.00% WP. The highest population (142.49 aphids/plant) was recorded in untreated control.