PROBLEM TO BE SOLVED: To provide a composition having excellent potency to control plant disease and a plant disease control method.SOLUTION: There are provided a plant disease control composition containing a tetrazolinone compound represented by the formula (1) and one or more kind of amidine compound selected from a group (A), and a plant disease control method including a process for treating plants or soil where plants are cultivated with effective amounts of the tetrazolinone compound represented by the formula (1) and one or more kind of amidine compound selected from the group (A). Group (A):N'-{4-[(4,5-dichlorothiazole-2-yl)oxy]-2,5-dimethylphenyl}-N-ethyl-N-methylmethane imide-amide or the like.SELECTED DRAWING: None【課題】植物病害に対する優れた防除効力を有する組成物及び植物病害防除方法を提供。【解決手段】式（１）で示されるテトラゾリノン化合物と、群（Ａ）より選ばれる1種以上のアミジン化合物とを含有する植物病害防除組成物、及び式（１）で示されるテトラゾリノン化合物と、群（Ａ）より選ばれる1種以上のアミジン化合物との有効量を植物または植物を栽培する土壌に処理する工程を含む植物病害防除方法。群（Ａ）：Ｎ’－｛４－［（４，５－ジクロロチアゾール－２－イル）オキシ］－２，５－ジメチルフェニル｝－Ｎ－エチル－Ｎ－メチルメタンイミドアミド、等からなる群。【選択図】なし
