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 pyridazine compound represented by the following formula (1) and one or more kind of amidine compound selected from a following 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 pyridazine compound represented by the following formula (1) and one or more kind of amidine compound selected from a following group (A). X is H or H. Group (A):N-{4-[(4,5-dichlorothiazole-2-yl)oxy]-2,5-dimethylphenyl}-N-ethyl-N-methylmethane imide-amide or N-(2,5-dimethyl-4-phenoxyphenyl)-N-ethyl-N-methylmethane imide-amide.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【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すること。【解決手段】式(1)で示されるピリダジン化合物と、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)で示されるピリダジン化合物と、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。〔XはH又はH〕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又はN’-(2,5-ジメチル-4-フェノキシフェニル)-N-エチル-N-メチルメタンイミドアミド【選択図】なし
