Antibiosis and Tolerance Mechanisms of Resistance in Rice Varieties Carrying Brown Planthopper Resistance Genes

Brown planthopper (BPH), Nilaparvata lugens (Stal.) is a major pest in rice production. Development of BPH-resistant varieties is an economical and effective way to control this pest. In the present investigation, 15 rice varieties were screened in greenhouse along with resistant and susceptible checks viz., Ptb 33 and TN1 respectively. They were also studied for BPH honeydew excretion, nymphal development period as indicators of antibiosis and days to wilt to identify level of tolerance to BPH in rice varieties. Among the 15 rice varieties, one is highly resistant five were resistant and five were moderately resistant. The rice varieties, T 12 and Ptb 33 showed high level of antibiosis and tolerance to BPH. Swarnalatha, Babawee, Pokkali, IR 64, IR 65482-7-216-1-2-3 and MUTNS-1 showed moderate level antibiosis and tolerance. IR 36 exhibited moderate level of antibiosis and high level of tolerance. ASD 7 showed low level of antibiosis and moderate level of tolerance.