Bio-efficacy and phytotoxicity of novel insecticides agianst brown plant hopper (Stal.), Nilaparvata lugens (Hemiptera: delhacidae) on rice

To study the bio-efficacy and phytotoxicity of novel insecticides against Brown Plant Hopper, Nilaparvata lugens in rice crop, trials were conducted at Agricultural Research Station, Kampasagar, Nalgonda District, Telangana during Kharif 2016 and 2017. Eight treatments i.e. Sulfoxaflor 24 SC @ 375 ml/ha, different dosages of Pymetrozine 50 WG @ 250 g/ha, 300 g/ha (GSP sample), 300 g/ha (Market standard) and 350 g/ha, Thiomethoxam 25 WG @ 100 g/ha and Buprofezin 25 SC @ 800 ml/ha and control were imposed in Randomized Block Design with three replications. The overall mean of BPH population prior to one day before spraying was found to be non significant. BPH population was low on Sulfoxaflor 24 SC @ 375 ml/ha and Pymetrozine 50 WG @ 350 g/ha followed by Pymetrozine 50 WG @ 300 g/ha (market standard), 300 g/ha (GSP sample), 250 g/ha, Thiomethoxam 25 WG @ 100 g/ha and Buprofezin 25 SC @ 800 ml/ha and were found to be on par to each other and superior to control at 1, 3, 5, 7 and 10 days after first spraying and similar trend was also noticed after second spraying. The highest grain yield was recorded on Sulfoxaflor 24 Sc @ 375 ml/ha and Pymetrozine 50 WG @ 350 g/ha which were on par to each other and remaining treatments had grain yield either low or high over the control. The phytotoxicity was not observed at 1, 3, 5, 7 and 10 days after spraying of single dose and double dosages of Pymetrozine 50 WG @ 375 g/ha.