Experiments were conducted to assess the antibiosis mechanism of resistance viz., nymphal survival, development period, growth index, fecundity and hatchability of brown planthopper (BPH), Nilaparvata lugens on some selected resistant rice cultures. The rice cultures viz., WGL II 218-5-1, Ptb 33 and RGL 7001 recorded significantly lowest per cent of nymphal survival than susceptible check, TN1. Significantly prolonged development period of BPH nymphs was observed in rice culture MTU IJ 206-7-4-1, MTU PLA 99-1-3-1-2, WGL II 218-5-1 and resistant check, Ptb 33 than susceptible check, TN1. All the tested rice cultures registered 1.31 to 6.37 time’s lower growth index than the susceptible check TN1. Growth index was significantly lowest in the rice cultures viz., WGL II 218-5-1, Ptb 33 and RGL 7001. Fecundity was significantly lowest on MTU IJ 206-7-4-1 and MTU 1075. The per cent hatchability of eggs was significantly lowest in MTU PLA 99-1-3-1-2.
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