A plant disease controlling composition is provided containing a pyridazine compound represented by formula (I):wherein R1 represents a chlorine atom, a bromine atom, a cyano group or a methyl group, and R2 represents a hydrogen atom or a fluorine atom and at least one azole compound selected from the group consisting of propiconazole, prothioconazole, triadimenol, prochloraz, penconazole, tebuconazole, flusilazole, diniconazole, bromuconazole, epoxiconazole, difenoconazole, cyproconazole, metconazole, triflumizole, tetraconazole, myclobutanil, fenbuconazole, hexaconazole, fluquinconazole, triticonazole, bitertanol, imazalil, ipconazole, simeconazole, and flutriafol.
