Antixenosis Resistance to Brown Plant Hopper, Nilaparvata lugens Stal. in Rice

The antixenosis resistance to brown plant hopper (BPH), Nilaparvata lugens was evaluated in 104 rice double haploid (DH) lines derived from a cross between IR 64 and Azucena. Nymphal preference at 12, 24, 48 and 72 hrs after release was assessed on DH rice lines by conventional seed box method. The BPH nymphs showed significant variation in the preference to DH lines. The overall mean population of nymphs on DH lines at 12,24,48 and 72 hrs after release was 2.18, 2.72, 3.61 a. d 4.36/seedling respectively. In general, the alighting response was more at 72 hrs after release. The parents 6IR 64 and azucena harboured a mean population of 2.94 and 5.18 nymphs/seedling respectively over different hours after release. In the susceptible TN 1, the population was 4.34 and 1.88 nymphs on the resistant Ptb 33.