The present invention provides the compounds represented by the general formula (I): [wherein X is a halogen atom or an (C1-C3)alkyl group which may be substituted with a halogen atom(s); Y is a hydrogen or halogen atom, or a cyano, a (C1-C3)alkyl or (C1-C3)alkoxy group; R is a hydrogen or halogen atom, a cyano group, or a (C1-C6)alkyl, (C2-C6)alkenyl group, (C2-C6)alkynyl, (C1-C6)alkoxy, (C2-C6)alkenyloxy, (C2-C6)alkynyloxy, (C1-C6)alkylthio, (C1-C6)alkylsulfinyl or (C1-C6)alkylsulfonyl group which may be substituted with a halogen atom(s), a (C1-C6)alkoxycarbonyl group, a (C1-C6)alkoxyimino(C1-C3)alkyl group, a tri(C1-C10)alkylsilyl group, or a phenyl, phenoxy, pyridyloxy or pyrimidyloxy group which may be substituted with a substituent(s); n is an integer of 1 to 5], which compounds cause reduced loads of deleterious, harmful effects to the earth environment, and exhibit a widened controlling spectrum at lowered chemical application rates, thereby finding useful application as a plant disease controlling agent for agricultural and horticultural uses.