There are few control agents against leaf blotch, among cereal diseases, and no sufficient control effect can be obtained thereon. Under these circumstances, the purpose of the present invention is to provide a novel control agent for diseases including leaf blotch and a method for using the same for the stable production of cereals. Provided are: a cereal disease control agent characterized by comprising, as active ingredients, fluoroimide or a salt thereof acceptable in agrochemical formulations combined with at least one compound selected from among (1) an SBI agent, (2) a QoI agent, (3) an SDHI agent and (4) an anilinopyrimidine-based fungicide or a salt thereof acceptable in agrochemical formulations and a method for using the same.
