Abstract
Several chemical and biological treatments were evaluated for control of take-all, caused by Gaeumannomyces graminis var. tritici, on winter wheat ( Triticum aestivum). None of the treatments resulted in an effective suppression of take-all (percentage of roots with symptoms or whiteheads) or an increase in yield in naturally or artificially infested field experiments over 3 years. In a controlled-environment study triadimenol, imazalil and a combination of carboxin and thiram reduced the percentage of plants infected, and inoculating soil with G. graminis var. graminis gave good control. Disease development in field studies was limited in the fall. The greatest disease development occurred in the spring with the increase in soil temperatures. The lack of control of take-all by fungicides, such as triadimenol, which have been reported to be effective in other studies is discussed in relation to the development of the disease in south-eastern USA.
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