Method for preventing wheat from mycotoxin contamination

A method for reducing deoxynivalenol contamination in a cereal comprising a step of applying a material consisting essentially of at least one compound selected from the group consisting of an alkali metal salt of phosphorous acid, an alkali metal salt of phosphorous acid ester, an alkaline earth metal salt of phosphorous acid, an alkaline earth metal salt of phosphorous acid ester and a combination thereof in a concentration of 0.56% or less of the total amount of the composition and in an amount sufficient for reducing a production of deoxynivalenol by plant pathogenic fungi in a cereal to 1.1 ppm or less, and optionally at least one fungicidal active ingredient for agri-horticulture selected from the group consisting of tebuconazole, metoconazole, propiconazole, azoxystrobin, kresoxim-methyl, iminoctadine acetate, iminoctadine albesilate, trifloxystrobin and sulfur to a plant of a cereal at heading stage or later.