This is to provide a plant disease control composition having a broad spectrum against various plant pathogens, and shows excellent controlling effects (synergistic controlling effects) which cannot be expected from a single component alone. A plant disease control composition comprising (Group a) at least one quinoline compound represented by the formula: (wherein R 1 , R 2 : an alkyl which may be substituted, an aryl which may be substituted, etc. R 3 , R 4 : H, an alkyl which may be substituted, etc. X: halogen, an alkyl which may be substituted, etc. Y: halogen, alkyl, etc. n: 0 to 4 m: 0 to 6) or a salt thereof, and at least one of fungicidal compounds selected from the group consisting of a Strobilurin series compound, a triazole series compound, etc., as effective ingredients.
