PROBLEM TO BE SOLVED: To provide an agricultural and horticultural fungicidal composition which exhibits excellent controlling effect on plant diseases even at low doses and does not pose concern for harmful effects on useful plants.SOLUTION: The present invention provides an agricultural and horticultural fungicidal composition which contains (I) agent I comprising nitrogen-containing heterocyclic compound represented by the formula (C) or salt thereof, and (II) agent II comprising DMI agent.SELECTED DRAWING: None【課題】低薬量でも植物病害に対して優れた防除効果を示し、かつ、有用植物に対する薬害の心配がない農園芸用殺菌剤組成物を提供する。【解決手段】（Ｉ）下記式（Ｃ）で表される含窒素ヘテロ環化合物またはその塩からなる薬剤Ｉと、［化１］ （ＩＩ）ＤＭＩ剤からなる薬剤ＩＩとを含有する、農園芸用殺菌剤組成物。【選択図】なし
