. Diseases of field crops in the Prairie Provinces. Plants; Cultures de plein champ; Cultures de plein champ; Plantes. FLAX. Figure 21.—Cracks in the seed coat of flax seed caused by injury in threshing during dry weather. Other Diseases Chlorosis (Nonparasitic)—A yellowing or chlorosis of young flax plants is common in many areas in Manitoba and Saskatchewan. Sometimes this condition is due to lack of aeration in water-logged soil. The lack of aeration results in a temporary nitrogen deficiency in the soil. When chlorosis occurs in the higher parts of fields, as well as in the low, wet spots,
. Diseases of field crops in the Prairie Provinces. Plants; Cultures de plein champ; Cultures de plein champ; Plantes. FLAX. Figure 21.—Cracks in the seed coat of flax seed caused by injury in threshing during dry weather. Other Diseases Chlorosis (Nonparasitic)—A yellowing or chlorosis of young flax plants is common in many areas in Manitoba and Saskatchewan. Sometimes this condition is due to lack of aeration in water-logged soil. The lack of aeration results in a temporary nitrogen deficiency in the soil. When chlorosis occurs in the higher parts of fields, as well as in the low, wet spots, it may be a sign of iron deficiency. This deficiency is induced by an excess of lime in the soil, which makes the iron unavailable to the plants. There are no practical control measures. Boll Blight (Nonparasitic)—The buds, flowers, and young bolls of flax plants often fail to develop, particularly when warm, dry weather follows a cool, moist spell (Fig. 22). Blighting of 30 per cent or more of the bolls commonly occurs. The cause of the trouble is not definitely known, but it seems to be a response by the plant, which sacrifices some of the bolls that were formed earlier during favorable conditions, but that cannot be brought to maturity because of drought, disease, or other factors. Top Dieback (Nonparasitic)—The upper portions of flax plants may turn brown after a hot spell during the ripening period. Usually the discoloration involves the upper third of the stem, but sometimes the whole plant may turn brown. The seeds of affected plants are usually thin and light. The discolored plants often occur in patches, but sometimes most of the plants in a field are affected. 73. 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
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