PROBLEM TO BE SOLVED: To provide a soil-borne disease controlling agent which exhibits high controlling effects against hardly controllable soil-borne diseases of Oryza sativa, does not cause environmental pollution, is not phytotoxic to Oryza sativa, is safe to humans and animals, and is surely effective.SOLUTION: The soil-borne disease controlling agent contains acetic acid as the principal component. Soil-borne diseases of Oryza sativa which have been conventionally hard to control can be efficiently controlled without producing phytotoxicity to Oryza sativa by pouring into soil still higher concentration of acetic acid, which has been used in low concentration because of its phytotoxicity.COPYRIGHT: (C)2010,JPO&INPIT【課題】防除困難であるイネの土壌病害に対して高い防除効果を発揮し、環境汚染を引き起こすことなく、またイネに薬害を生じさせることもない、人畜に安全で確実なイネ用の土壌病害防除剤を提供する。【解決手段】酢酸を主成分として含むイネ土壌病害防除剤。従来、植物に薬害を生じるため低濃度で用いられてきた酢酸をさらに高濃度で土壌に灌注処理することにより、イネに薬害を生じることなく、従来防除が困難であった土壌病害を効率的に防除できる。【選択図】なし