. Diseases of field crops in the Prairie Provinces. Plants; Cultures de plein champ; Cultures de plein champ; Plantes. Diseases of Grasses Grass diseases are prevalent throughout Western Canada but the losses which they cause are difficult to determine. Much of the hay crop is harvested from mixed stands or from naturally seeded wild meadows, and in such cases diseases usually do not become epidemic as they do in cereal crops where large areas are planted to one variety. Most of the many diseases of grasses are similar to those already described on the cereal crops and no detailed description
. Diseases of field crops in the Prairie Provinces. Plants; Cultures de plein champ; Cultures de plein champ; Plantes. Diseases of Grasses Grass diseases are prevalent throughout Western Canada but the losses which they cause are difficult to determine. Much of the hay crop is harvested from mixed stands or from naturally seeded wild meadows, and in such cases diseases usually do not become epidemic as they do in cereal crops where large areas are planted to one variety. Most of the many diseases of grasses are similar to those already described on the cereal crops and no detailed description of ail the individual diseases will be attempted. Root Rots—Snow mold may cause severe damage in cultivated and native grasses in the central and northern areas (Fig. 28). The appearance of the disease is similar to winter crown rot of alfalfa and clovers, which is caused by the same fungus. Crop rotation with a spring-sown cereal crop is the best method of control. Brome and crested wheat grass are highly resistant and can be safely planted in infested land. Common root rot, browning root rot and take-all occur on the grasses as well as on 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Canada. Agriculture, Department of; Canada. Dept. of Agriculture. Ottawa [Queen's Printer]
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