Exploration of rice germplasm to locate new sources of resistance against brown plant hopper, Nilaparvata lugens (Stål)

Screening of 20 rice genotypes using standard seed box screening technique (SSST) and 0-9 rating scale revealed that, two genotypes namely IR-65482-7-2-216-1-2-B, and PTB 33 were found resistant with mean mortality as 7.5% against BPH whereas genotype ASD7 (Acc 6303), Milyang 63, RP 2068-18-3-5, and Swarnalatha (Acc33964) were moderately resistant with mortality ranging 20 to 22.5%. Six entries, Babawee, IR 36, ARC 10550, IR-71033-121-15, MUTNS 1, and Rathu Heenati were found moderately susceptible with a damage score of 7 and mean seedling mortality ranging 32.5 to 57.5%, and the remaining 7 entries were susceptible with a damage score of 9 and mean seedling mortality of 82.5 - 97.5% Least honeydew production was recorded in IR-65482-7-2- 216-1-2-B (102.3 mm²) by BPH while antibiosis mechanism by nymphal survival was found least in RP 2068-18-3-5 (20.0%) as compared to the susceptible check TN1 where honeydew production and nymphal survival was 519.0 mm² and 76.7%, respectively, ASD7 (Acc 6303) showed highest tolerance to wilting due to BPH infestation.