Studies on Brown Planthopper Resistance in Rice (Oryza sativa L.)

In India, Rice is a major food crop and consumed by majority of Indian population. The crop often encounters various pests and diseases. Hence, development of Resistant varieties or resistant donors is a continuous process to reduce the losses due to the pests and diseases. Keeping in view of the above, a Research programme was carried out with an objective to study the Brown planthopper (BPH) (Nilaparvata lugens Stal) resistance reactions in the resultant hybrids when crosses were attempted with different sources of resistance against BPH. The current study was carried out at Agricultural Polytechnic (APT), Polasa, Jagtial. Eight lines and three testers were crossed line x tester mating design during Kharif, 2021 and the resultant 24 hybrids were evaluated in Randomized Block Design during Rabi, 2021-22. Among the hybrids, the damage score ranged from 3.2 (CMS 23A x JGL33124 and CMS 46A x JGL 33124) to 9.0 (CMS 23A x KNM 7787, JMS 11A x RNR 21278 and JMS 18A x RNR 21278). Ten hybrids exhibited moderately resistant reaction, one was moderately susceptible, ten were susceptible and three hybrids exhibited highly susceptible reaction. The cross, CMS 46A x JGL 33124 which recorded on par grain yield per plant over the hybrid check, 27 P 31 displayed moderately resistant reaction to BPH.