12A tetrazolinone compound represented by formula (1) has excellent controlling effect on plant diseases. (In the formula R represents a hydrogen atom a C1 C3 alkyl group which may have one or more halogen atoms a C1 C3 alkoxy group which may have one or more halogen atoms a halogen atom or a C1 C3 alkylthio group which may have a cyano group or one or more halogen atoms； and R represents a C1 C3 alkyl group which may have one or more halogen atoms a C1 C3 alkoxy group which may have one or more halogen atoms a hydrogen atom a halogen atom or a C3 C4 cycloalkyl group which may have one or more halogen atoms.)
