Re-screening and Control Efficiency of Bio-control Strains against Rice Bacterial Leaf Streak and Rice Sheath Blight in Greenhouse

5 bacterial strains against rice bacterial leaf streak and 5 other bacterial strains against rice sheath blight, which were screened in former experiments, were re-screened and the control effects on two diseases and the applicable effects on rice growth by bioassay in vivo were tested separately. The results indicated that the suspensions of bacterial strains GN223, GN222 and GN233 had control effects on rice bacterial leaf streak in seedling stage, of which the control effects of strain GN233 was 28.90%, and that with wet-table powder TM duo·fu was 34.20%. As to rice sheath blight, 5 bacterial strains had different control effect, of which the control effect of bacterial strains GN222 and bacterial strain GN221 was 44.4% and 27.8% respectively, and that with wettable powder daofeng was 33.3%. In addition, it was found that bacterial strains GN222, GN233 and GN211 could promote the growth of rice. This research results can establish the research basis for biological control against rice bacterial leaf streak and rice sheath blight.