This invention aims to provide a compound of the formula (1) or a salt thereof that is effective as a germicide for agriculture and horticulture. In the formula, R1 represents a hydroxyl group, a cyano group or the like, R2, R3 and R4 each independently represent a hydrogen atom, a halogen atom or the like, R5 represents a hydrogen atom, a halogen atom or the like, X represents an oxygen atom or a sulfur atom, Y represents a phenyl group, a pyridyl group or the like, and a bond including broken line part represents a double bond or a single bond.本發明之課題為提供作為農園藝用殺菌劑為有效的式(1)的化合物或其鹽。 式中,R1表示羥基、氰基等,R2、R3及R4各自獨立地表示氫原子、鹵素原子等,R5表示氫原子、鹵素原子等,X表示氧原子或硫原子,Y表示苯基、吡啶基等,含有破折線部之鍵結代表雙鍵或單鍵。