Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 294 Diseases of Economic Plants Blight ' (Pseudomonas sp.). — This disease was described by Burrill in 1889. It shows chiefly as a dwarfed condition which may occur in spots in the field, varying in size from a few square rods to an acre or more. The affected plants finally turn yellow, and most of them die. The lowest roots of dis- eased plants, in some cases comprising half of the root system, die. The stalk near the base, when split lengthwise, shows a uni- form, dark color which also appears
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 294 Diseases of Economic Plants Blight ' (Pseudomonas sp.). — This disease was described by Burrill in 1889. It shows chiefly as a dwarfed condition which may occur in spots in the field, varying in size from a few square rods to an acre or more. The affected plants finally turn yellow, and most of them die. The lowest roots of dis- eased plants, in some cases comprising half of the root system, die. The stalk near the base, when split lengthwise, shows a uni- form, dark color which also appears in the upper nodes in lesser degree. Rust (Puccinia sorghi Schw.). — Corn rust seems to have taken its place in literature in 1815. It is comparatively of slight importance, since it does not usually develop early in the season, though in exceptionally favorable climatic conditions it may do so. The brown sum- mer spores appear first in linear sori, and the black winter spores come later in the season. The cluster- cup stage is found upon the wood sorrel (Oxalis). Yellow-leaf ' (Helminthosporiurn inconspicuum C. & E.). — This blight gives a somewhat frostbitten ap- pearance to the plants, producing also a thin olive-green Fig. 155. — Portion of corn leaf show ing sori of rust.
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