The experiment was conducted for investigation of the effectiveness of bacteriophages and bacteriocide application in controlling bacterial wilt caused by R. solanacearum on Chrysanthemum sp. in field conditions. The results found that all treatments applied with bacteriophages or bacteriocide showed effect in reduction of bacterial wilt disease more than 50%. The treatment applied with single bacteriophage ΦBT56 was more effective than treatment applied with bacteriophage mixture. The treatment combine bacteriophage ΦBT56 and bacteriocide (Streptomycin and Oxytetracyline) was more effective in disease reduction than treatment applied with single bacteriophage Φ56. In conclusion, apply phage or bacteriocide (Streptomycin and Oxytetracyline) could reduce bactetial wilt on A sp. and combination bacteriophage plus bacteriocide could increase disease reduction effectiveness in the field conditions.