. Figure 28 -nold) injury to lawn grass. Smut—Head smut (Ustilago bullata) is widely distributed in Western Canada on a large number of grasses and sometimes causes serious losses to the wheat grasses. Diseased heads appear dark brown to purple black. All or part of the floral structures may be destroyed by the smut fungus and usually the heads on all the stems produced by an infected plant are diseased. Seedling infection occurs from seed contaminated with spores during 98

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