author(s)
M Thamarai and RP Soundararajan

abstract
The study was carried out in the Entomology glass house at Paddy Breeding Station, Tamil Nadu Agricultural University, Coimbatore during June to August 2016. In the present investigation antibiosis parameters of resistance viz., nymphal survival, nymphal duration and growth index was evaluated in 26 rice genotypes under glasshouse condition to Coimbatore population of BPH. Low survival rate was recorded on Ptb33 (26.67%), PY 1 and Mapillai Samba (30.00%) whereas prolonged development period of nymphs was recorded in Ptb 41 (14.37 days) and Karuthakar (14.23 days). Low growth index value was observed on Ptb 33 (1.90) and ADT 36 (2.75). Ptb 33 which possess Bph 3 gene confirmed its high level of antibiosis to local BPH population. The genotypes IR 64 and Mudgo with Bph1 gene, Chinsaba (bph 8), Pokkali (Bph 9), IR 65482-7-216-1-2-B (Bph 18 gene) were recorded with moderate level of antibiosis to the BPH population.