Abstract
The establishment by the Japanese government of a tentative guideline level (1.1 mg/kg) for deoxynivalenol (DON) in wheat has drawn new attention to Fusarium head blight control. This report describes the urgent and tentative recommendations set out by the Hokkaido government for DON reduction. First, the use of the intermediate-resistant cultivar Haruyokoi is recommended. The second recommendation regards chemical control; i.e., the timing and frequency of fungicide application and the selection of fungicide effective for DON control. Four serial applications, the first of which started at the beginning of flowering, was found to be effective. We selected the five following fungicides: tebuconazole, propiconazole, kresoxim-methyl, iminoctadine-acetate, and thiofanate-methyl. We demonstrated that sieve sorting and gravity sorting could separate the grain exceeding the guideline level into grains having different DON levels. Thus, we recommend gravity sorting and sieve sorting. We encourage producers to use all the recommendations comprehensively.
