Influence of nitrogen and rice varieties on population build up of brown planthopper, Nilaparvata lugens (Stal.)

Studies conducted on the influence of four levels of nitrogen (0, 60, 120 and 200 kg N/ha) and four varieties (TN1, Triguna, Vijetha and DRRH1) of rice on brown planthopper revealed that the BPH population buildup was low up to 60 kg N/ha irrespective of the levels of BPH resistance of the varieties. At 120 and 200 kg N/ha population buildup varied with levels of resistance of a variety.