Difenoconazole Seed Treatment for Control of Dwarf Bunt of Winter Wheat

Abstract

We evaluated difenoconazole (Dividend 3FS), thiabendazole (Mertect LSP), triadimenol (Baytan 30F), and carboxin plus thiram (Vitavax 200) as seed treatments for control of dwarf bunt (caused by Tilletia controversa) on the susceptible winter wheat (Triticum aestivum) cultivars Nugaines and Hatton. Seed was planted at various dates during the fall of 1990 and 1991 at Logan, UT; Kalispell, MT; Pullman, WA; and Cavendish, ID. Dwarf bunt was most severe on plants that had developed to the two- to five-leaf stage in late fall before snowfall. Difenoconazole at 0.12 g a.i./kg provided complete control at all locations when wheat was seeded at intermediate and late dates