The screening activity is conducted at seedling stage on the standard seedbox screening test (SSST) according to method established by IRRI (Pathak and Khush, 1979). The test varieties are seeded in rows 5cm apart in seedbox. Each line is planted randomly in a 20cm long row (20 seedlings) along with resistant (Rathu Heenati) and susceptible check (TN1). Ten day old seedlings were infested with 3rd instar nymphs at the rate of 10 per seedling. After 10 days, at the time TN1 plants were almost completely died (score 9), the BPH resistance scores of plants were assessed as described by 5th edition of the Standard Evaluation System for Rice (SES, IRRI) (2013).