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Triadimefon for Control of Powdery Mildew of Wheat. Graydon C. Kingsland, Associate Professor, Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29631. Plant Dis. 66:139-141. Accepted for publication 28 April 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-139.

Triadimefon controlled powdery mildew (Erysiphe graminis f. sp. tritici) on two varieties of winter wheat (Triticum aestivum) during two growing seasons when applied as a foliar spray at one, two, or three rates on one, two, or three dates. Final disease intensity on the middle and lower culm leaves was substantially less following one application at the lowest rate, even when powdery mildew was established on the lower leaves at the time of application. The two uppermost leaves were also protected after receiving a single application of triadimefon at the lowest rate. Triadimefon suppressed the development of active lesions and inhibited sporulation. Yields from sprayed plots were always greater than those from unsprayed plots, but the differences were not statistically significant.