Dollar spot, a foliar disease caused by Sclerotinia homoeocarpa, continues to be one of the most severe diseases of golf course turfgrasses. A survey was conducted to determine the distribution of fungicide resistance in populations of this pathogen from putting greens and fairways in North Carolina. Isolates (30-50 per location) were collected from 15 locations, including 13 exposed populations from golf courses and 2 unexposed baseline populations. Baseline populations contained low frequencies of thiophanate-methyl resistance (5% and 10%), but 95% of isolates from exposed populations were resistant to this fungicide. Resistance to iprodione was detected in one location on Poa annua putting greens in Western NC. Mean EC₅₀ values for propiconazole were 0.017 and 0.019 in baseline populations. Mean EC₅₀ values for exposed populations ranged from 0.018 (resistance factor = 1) to 0.068 (resistance factor = 3.78). Four separate field experiments were inoculated on 18 Apr 2005 with a mixture of S. homoeocarpa isolates with mean propiconazole EC₅₀ values of 0.011, 0.020, 0.033, or 0.054. Experiments were mowed separately to prevent spread among plots inoculated with different isolates, and fungicide-treated buffer areas were maintained between experiments. Fungicide treatments were applied on a curative basis on 3 May 2005 and 26 May 2005. All fungicides provided excellent curative control of the S. homoeocarpa population with mean EC₅₀ value of 0.011. Reduced propiconazole efficacy was observed in populations with mean EC₅₀ values of 0.020, 0.033, and 0.054. Applications of boscalid and iprodione were generally less effective for control of populations with mean EC₅₀ values of 0.033 and 0.054 ppm. Reduced efficacy of curative DMI applications may occur at EC₅₀ values as low as 0.020, and the curative control provided by other fungicide classes may also be impacted by shifts in DMI sensitivity.