Evaluation of insecticides against brown plant hopper, Nilaparvata lugens (Stal) in rice, Oryza sativa L.

A field experiment was conducted to determine the comparative efficacy of some insecticides against brown plant hoppers (BPH) in rice during kharif 2019. The treatments were acephate 75 SP @ 1.50g/L, clothianidin 50 WDG @ 0.05g/L, fipronil 5 SC @ 2.0 ml/L (6.93), flonicamid 50 WG @ 0.30g/L (6.70) imidacloprid 17.8 SL @ 0.20ml/L, thiamethoxam 25 WG @ 0.20g/L, quinalphos 25EC @ 2.0ml/L and untreated control. Flonicamid 50 WG @ 0.30g/L found to the most effective treatment for the control of BPH by recording the highest per cent reduction of 95.11% over control among all the treatments and it was follwed by acephate 75 SP @ 1.50g/L (85.60), clothianidin 50 WDG @ 0.05g/L (85.16) and imidacloprid 17.8 SL @ 0.20ml/L (83.37). The untreated control recorded maximum of 36.36, 36.43 and 34.96 number of BPH/hill at 3, 7 and 14 days after second spray. The grain yield differnce due to various insecticidal treatments were significant. The treatment with flonicamid 50 WG @ 0.30g/L recorded highest yield of 56.33 q/ha. However, it was at par with acephate 75 SP @ 1.50g/L (53.62 q/ha), clothianidin 50 WDG @ 0.05g/L (52.71 q/ha), thiamethoxam 25 WG @ 0.20g/L (50.90 q/ha), imidacloprid 17.8 SL @0.20ml/L (50.63 q/ha), fipronil 5 SC @ 2.0 ml/L (49.45 q/ha) and quinalphos 25EC @ 2ml/L (44.58 q/ha). The lowest of 34.62 q/ha grain yield was recorded in untreated control. The highest 54.88 per cent increase in yield over control was recorded in treatment with flonicamid 50 WG @ 0.30g/L. It was followed by acephate 75 SP @ 1.50g/L (54.88%) and clothianidin 50 WDG @ 0.05g/L (52.25%).