PROBLEM TO BE SOLVED: To provide a novel bactericide, particularly a bactericide for agricultural and horticultural use.SOLUTION: The present invention provides a substituted pyridazine compound represented by formula (1) [where R1 is a halogen atom, a C1-C6 alkoxy group or the like, R2 and R3 are a halogen atom, a nitro group, a cyano group or the like, R4 is a C1-C6 alkyl group or the like, X is a halogen atom, W is an oxygen atom or the like, Z is a hydrogen atom, a C2-C6 alkynyl group or the like, p is an integer of 1-5, q is an integer of 1-4, and r is an integer of 0-4], and a bactericide for agricultural and horticultural use comprising the same.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】新規な殺菌剤、特に農園芸用殺菌剤の提供。【解決手段】式(1):[式中、R1は、ハロゲン原子、C1~C6アルコキシ基等を表し、R2及びR3は、ハロゲン原子、ニトロ基、シアノ基等を表し、R4は、C1~C6アルキル基等を表し、Xは、ハロゲン原子を表し、Wは、酸素原子等を表し、Zは、水素原子、C2~C6アルキニル基等を表し、pは、1~5の整数を表し、qは、1~4の整数を表し、rは、0~4の整数を表す。]で表される置換ピリダジン化合物及びそれらを含有する農園芸用殺菌剤。【選択図】なし
