Diseases of field crops in Diseases of field crops in the Prairie Provinces disoffieldcrop Year: 1957 DISEASES OF FIELD CROPS Figure 22.—Boll blight of flax, a nonparasitic disease. Virus Yellows (Aster yellows virus, suspected)—A virus disease, spread by leafhoppers, has been widespread in Manitoba and Saskatchewan since 1952, but has not caused appreciable losses. It causes stunting, yellowing and bunching of the upper leaves, and distortion of the flower parts (Fig. 23). The petals remain greenish and leaf-like. Affected flowers do not set seed. Destruction of weeds in and near the fla
Diseases of field crops in Diseases of field crops in the Prairie Provinces disoffieldcrop Year: 1957 DISEASES OF FIELD CROPS Figure 22.—Boll blight of flax, a nonparasitic disease. Virus Yellows (Aster yellows virus, suspected)—A virus disease, spread by leafhoppers, has been widespread in Manitoba and Saskatchewan since 1952, but has not caused appreciable losses. It causes stunting, yellowing and bunching of the upper leaves, and distortion of the flower parts (Fig. 23). The petals remain greenish and leaf-like. Affected flowers do not set seed. Destruction of weeds in and near the flax crop may help to reduce the amount of virus and the numbers of the leafhoppers which carry it. 74
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