(In the formula, A-B, the present invention provides a compound of formula (I) the following formula (II): C = N, the formula (III): or CH-NR 9, formula (IV): N-C (= Y) are each independently, R 4 and 2, R 3 .R refer to either 1, R is, R 8 and 6, R 7 .R represents a hydrogen atom, a halogen atom, an alkyl group or the like C1~20 5, R is, independently, the .n represents a halogen atom or the like. Equation represents an integer of 0~4 .X represents a hydrogen atom, a halogen atom, an alkyl group C1~20 etc., (III) in ,. formulas represents a hydrogen atom, an alkyl group C1~20 (IV) in the Y, R 9 is, and their salts, or its nitrogen-containing heterocyclic compound represented by.) that represents a sulfur atom or an oxygen atom of providing agricultural and horticultural fungicide containing as an active ingredient at least one. [Formula 1]本発明は、式(I)(式中、A-Bは、下記式(II):C=N、式(III):CH-NR9、または式(IV):N-C(=Y)のいずれかを表す。R1、R2、R3およびR4は、それぞれ独立して、水素原子、ハロゲン原子、C1~20アルキル基等を表す。R5、R6、R7およびR8は、それぞれ独立して、水素原子、ハロゲン原子、C1~20アルキル基等を表す。Xは、ハロゲン原子等を表す。nは、0~4のいずれかの整数を表す。式(III)中、R9は、水素原子、C1~20アルキル基等を表す。式(IV)中、Yは、酸素原子または硫黄原子を表す。)で表される含窒素複素環化合物またはその塩、およびこれらの少なくとも1種を有効成分として含有する農園芸用殺菌剤を提供する。【化1】
