The 2270 of rice germplasm resources from International Rice Bacterial Blight Nursery( IRBBN)were evaluated against rice bacterial blight disease in South China. The identified results against the pathotype Ⅳwhich was the most predominant indicated that 500 varieties( 22. 03%) were highly resistant( scale 1),617 varieties( 27. 18%) resistant( scale 3),355 varieties( 15. 64%) moderately susceptible( scale 5),373 varieties( 16. 43%) susceptible( scale 7) and 425 varieties( 18. 72%) highly susceptible( scale 9...