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Control of Common and Dwarf Bunt of Wheat by Seed Treatment with Thiabendazole. J. A. Hoffmann, Plant Pathologist, Plant Science Research Division, ARS, USDA, Pullman, Washington 99163; Phytopathology 61:1071-1074. Accepted for publication 2 April 1971. DOI: 10.1094/Phyto-61-1071.

Thiabendazole [2-(4-Thiazolyl)-benzimidazole], 60% active, controlled seed- and soil-borne common bunt of wheat when used as a seed treatment at 1.6 g/liter (2 oz/bu). Dwarf bunt was controlled at most test locations by seed treatment at 3.2 g/liter (4 oz/bu). Effectiveness of Thiabendazole against dwarf bunt increased with lateness of seeding, suggesting that effectiveness depends on the amount of plant growth prior to infection. Control of dwarf bunt by seed treatment indicates that Thiabendazole may persist in the wheat plant for several months.

Additional keywords: Tilletia caries, T. foetida, T. controversa, Triticum aestivum, fungicides.