Disclosed is a plant disease control composition which has multiple disease spectra against various plant pathogenic bacteria and can exhibit an excellent control effect (a synergistic control effect) that is unpredictable from a single component. The plant disease control composition is characterized by comprising, as active ingredients, at least one quinoline compound represented by general formula (I) [wherein R1, R2 independently represent an alkyl group which may be substituted, an aryl group which may be substituted, or the like； R3 and R4 independently represent H, an alkyl group which may be substituted, or the like； X represents a halogen atom, an alkyl group which may be substituted, or the like； Y represents a halogen atom, an alkyl group, or the like； n represents 0 to 4； and m represents 0 to 6] or a salt thereof (group a) and at least one bactericidal compound selected from the group consisting of a strobilurin compound, a tnazole compound and others.
