Fuente: WIPO "tomato" The present invention provides an excellent control method against plant diseases. A compound represented by formula (I)[wherein:n represents 0, 1, or 2;the combination of X3 and Z represents:a combination whereinX3 represents CR3, andZ represents a C2-C6 chain hydrocarbon group or the like;or, a combination whereinX3 represents a nitrogen atom, andZ represents a C2-C6 chain hydrocarbon group or the like;X1 represents CR1 or a nitrogen atom;X2 represents CR2 or a nitrogen atom;X4 represents CR4 or a nitrogen atom (provided that among X1, X2, X3, and X4, the number of nitrogen atom is 0, 1, or 2); andR1, R2, R3, and R4 are identical to or different from each other, and each represent a methyl group optionally substituted with one or more fluorine atom(s) or the like] or an N-oxide thereof, or a salt thereof can be used for controlling plant diseases.