Pyridazine compound and use thereof

A compound of the formula (2):

• (wherein,
• R2 represents a C1-C4 alkyl group,
• R3 represents a halogen atom, nitro group, cyano group, C1-C4 alkyl group optionally substituted with at least one halogen atom, C1-C4 alkoxy group optionally substituted with at least one halogen atom or C1-C4 alkylthio group optionally substituted with at least one halogen atom,
• m represents an integer of 0 to 5, and when m is an integer of 2 or more, R3s are mutually the same or different,
• Q represents a 6-membered aromatic heterocyclic group having at least one nitrogen atom as a ring constituent atom, and the aromatic heterocyclic group is optionally substituted with at least one substituent selected from the group consisting of halogen atoms, nitro group, cyano group, C1-C4 alkyl groups optionally substituted with at least one halogen atom and C1-C4 alkoxy groups optionally substituted with at least one halogen atom.).