Management of Maruca vitrata with eco-friendly insecticides in blackgram

Field experiment was conducted at Agricultural Research Farm, Banaras Hindu University, Varanasi during Kharif season of 2014 and 2015 to test the effect on per cent reduction over control in population of relirite. All the treatments were found significantly superior over control. The highest reduction were found after 7^th days of application in the treatment of spinosad 45 SC (81.65%) followed by indoxacarb 14.5 SC (77.03%) and lambdacyhalothrin 5 EC (70.49%) which were proved very effective against spotted pod borer. The next effective treatments were profenophos 50 EC, emamectin benzoate 5 SG and imidacloprid 17.8 SL and the least effective treatments were NSKE (42.27%), thiamethoxam 25 WG (50.77%) and acetamiprid 20 SP (53.47%) against spotted pod borer population over control after first and second spray during both years. The per cent pod damage was found less in the plots treated with spinosad followed by indoxacarb and lambdacyhalothrin. The highest pod damage was found in case of thiamethoxam, acetamiprid and imidacloprid treated plots against spotted pod borer. The maximum yield was recorded in spinosad 45 SC but at par with indoxacarb14.5 SC, lambdacyhalothrin 5 EC, profenophos 50 EC and emamectin benzoate 5 SG. The lowest yield was recorded in NSKE followed by acetamiprid 20 SP, imidacloprid17.8 SL and thiamethoxam 25 WG. The net return was highest in spinosad treated plots in case of all treatments, but the maximum benefit: cost ratio was obtained by the application of lambdacyhalothrin followed by thiamethoxam and profenophos.