Efficacy of different insecticides against brown planthopper, Nilaparvata lugens (Stål) in rice

Abstract

The on farm trials were conducted to determine the efficacy of conventional and novel insecticides against brown planthopper (BPH), Nilaparvata lugens (Stål), in rice during kharif 2017 and 2018. All the treatments were effective for BPH management than control. The results of the first year study revealed that the application of Imidacloprid 17.8 SL @ 100 ml ha-1 was found superior by registering lower population of BPH (4.70/ hill) followed by Flonicamid 50 WG @ 150 g ha-1 with 5.67 BPH/hill after 7 days after spray. However, during the second year trial conducted on different insecticides revealed that BPH population was recorded lowest i.e., 3.60 per hill with the application of Buprofezin 25 SC @ 1000 ml ha-1 after 10 days after spray. The effect of this insecticide application was also resulted in the highest grain yield (74.51 q/ha) and maximum benefit cost ratio (6.09).