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The rice brown planthopper(Nilaparvata lugens St(a)l,BPH)(Hemiptera, Delphacidae), is one of the most serious pests for rice in Asia.Elucidation of BPH virulence mechanisms against the resistant rice plants have become important tasks.The analysis of gene expression in BPH with different virulent or in BPH feeded on different rice variety might unveil the molecular basis of virulent shift and change.