Fuente: WIPO "tomato" Methods are provided for controlling a plant disease caused by a bacterium of genus Xanthomonas, comprising contacting a bacteriophage to a target plant, and for identifying a bacterium of the genus Xanthomonas, involving: culturing a test bacterium isolated from a plant tissue affected by a plant disease to obtain a culture; mixing the culture with a bacteriophage to obtain a mixture; culturing the mixture under a predetermined condition; and determining that the test bacteria are bacteria of the genus Xanthomonas when the test bacteria are lysed after the mixture-culturing step.