Control of Ergot in Buffelgrass with Triadimefon. J. Craig, Plant Pathologist, Southern Crops Germplasm Research Unit, Agricultural Research Service, U.S. Department of Agriculture, College Station, TX 77840. K. W. Hignight, Technician, Southern Crops Germplasm Research Unit, Agricultural Research Service, U.S. Department of Agriculture, College Station, TX 77840. Plant Dis. 75:627-629. Accepted for publication 5 December 1990. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1991. DOI: 10.1094/PD-75-0627.

The systemic fungicide triadimefon was tested for its ability to control ergot in buffelgrass at concentrations of 0.00375, 0.0075, or 0.015% a.i., applied at the rate of 1 L/80 cm² clump of grass, with spray application frequencies of twice per week, once per week, and once every 2 wk. Significant (P < 0.01) negative relationships were found between ergot incidence and triadimefon concentration and between ergot incidence and the number of applications per 2-wk interval. In two field trials with ergot incidences of 71 and 54% in the check treatments, the most effective triadimefon treatment, 0.015% a.i. applied twice per week, reduced ergot incidences to 8 and 2%, respectively.