Evaluation of new insecticides against rice brown plant hopper

Evaluation of six insecticides viz., ethiprole 40 + imidacloprid 40 WG, etofenprox 10 EC, buprofezin 25 SC, pymetrozine 50 WG, acephate 75 SP and monocrotophos 36 SL were evaluated against rice brown plant hopper BPH. The BPH population was counted on 20 randomly selected hills before spray at 1, 3, 7 and 10 days after spray. The experiment was conducted during kharif 2014 and 2015 at the Agricultural Research Station, Kampasagar, laid out in Randomized Block Design with three replications. All the insecticides significantly reduced the BPH. The BPH population varied from 114.0 to 156.6 and 133.4 to 176.6/20 hills during kharif 2014 and 2015 at one day prior to spray. The population was significantly lower with pymetrozine 50 WG @ 250 g/ha, followed by ethiprole 40 + imidacloprid 40 W.G @ 125 g/ha, etofenprox 10 EC @ 750 ml/ha, acephate 75 SP @ 667g/ha, monocrotophos 36 SL @ 1390 ml/ha and buprofezin 25 SC @ 825 ml/ha at all the counting days of after spray in both 2014 and 2015. The maximum reduction of population was found with pymetrozine 50 WG. The highest grain yield was obtained with pymetrozine 50 WG @ 250 g/ha in kharif 2014 and 2015.