Tolerance evaluation of rice varieties to the brown plan-thopper,Nilaparvata lugens feeding

The brown planthopper, Nilaparvata lugens (Stal) (BPH) is one of the most important insect pests of rice in China and other east-southern Asian countries. Utilization of rice resistance varieties is one of the most e-conomic and effective ways for controlling N. lugens . The resistance of rice varieties declined due to the change of BPH biotype. The current resistance screening methods based on biotic reaction also may eliminate numerous rice varieties with high-yielding and/ or good grain quality which were not resistant to BPH but had strong tolerance to BPH.