Bio-efficacy of granular insecticides against Nilaparvata lugens (Stal.) in Rice under field condition

The infestation of Nilaparvata lugens was effectively controlled by application of fipronil + imidacloprid 80 WG and found to be most effective and significantly superior over all other treatments (8.42 hill⁻¹). Rynaxypyr 0.4 G stood second in order of effectiveness which recorded 9.13 hopper population hill⁻¹. Treatment with fipronil 0.3 G proved next effective treatment by recording 11.33 and found at par with cartap hydrochloride recorded 11.64 hopper population hill⁻¹. This was followed by chloropyriphos, carbofuron and phorate in which 13.23, 14.56 and 15.53 hopper population hill⁻¹ observed as against 22.61 hoppers hill⁻¹, respectively in untreated control. The highest grain yield of rice (43.54 q ha⁻¹) was obtained in a treatment with fipronil + imidacloprid.