Studying the mechanisms of resistance in different rice accessions against brown planthopper (Nilaparvata lugens)

Plant resistance has been recognized as the most desirable and economic tactic in the management of rice brown planthopper, Nilaparvata lugens. Three modalities or mechanisms of resistance has been utilized in resistance. In resistant varieties, lowest nymphal preference, fecundity, survival growth index, population build up, functional plant loss index, prolonged nymphal period were compared with susceptible variety TN-1. Results on host preference by BPH nymphs on selected rice accessions/varieties indicated that BG 367-2 and Kattanur were less preferred. There was an increase in the number of hoppers that settled on each variety with a corresponding increase in the period of exposure.