Sensitivity Distributions of California Populations of Colletotrichum cereale to the DMI Fungicides Propiconazole, Myclobutanil, Tebuconazole, and Triadimefon

The baseline sensitivity of a California population of Colletotrichum cereale (turfgrass anthracnose) to the sterol demethylation inhibitor (DMI) fungicide propiconazole was determined using an in vitro assay with known reproducibility. The 50% effective dose (ED50) values for propiconazole for a nonexposed, baseline population ranged from 0.025 to 0.35 μg/ml with a mean of 0.14 μg/ml. Examination of two DMI-exposed populations indicated an approximate increase of 6.5x in mean ED50 values. In vivo testing of two isolates with ED50 values of propiconazole at 0.15 and 0.90 μg/ml indicated reduced control for the less sensitive isolate by propiconazole at rates