Examining Resistance to DMI Fungicides By Tom Hsiang, PhD T urfgrass managers are often concerned about the development of fungicide resistance, particularly if they have experienced it previously. In Canada, there are fewer fungicides available compared to the United States, and we need to ensure the activity of the registered products remains efficacious. American statistics show the turf fungicide market is larger than for any other single 20 May 2013 CG_May2013.indd 20 4/15/13 10:47:02 AM