Mechanisms of resistance to the brown planthopper in the rice lines bred from Mudgo cultivar at the TARC

The brown. planthopper, Nilaparvata lugens STAL, is the most destructive insect pest of the rice plant, causing severe damage called "hopper burn". The mechanisms of resistance were determined in the five rice lines bred from the original cross between a susceptible japonica cultivar and the highly resistant indica one, "Mudgo". The laboratory and field tests indicated that non-preference played an important role in resistance, followed by tolerance. Antibiosis appeared to be least part of resistance. Non-preference of the planthopper adult was distinct in the advanced growth stage of the rice plant as compared with the seedling stage.