. Diseases of economic plants. Plant diseases. FIBER PLANTS 399 and" die. A single leaf often presents the three conditions, green (healthy), yellow (sick), and brown (dead), side by side in bands, parallel to the main ribs and radiating from the leaf stem. The dead parts may break away, leav- ing the leaf ragged. The upper leaves follow rapidly over the course of the lower leaves. The leaves as soon as badly affected fall away, leaving only a bare stalk. In mild cases,. Fig. 173. — A variety of cotton resistant to the wilt; note the complete failure of the other varieties. After Orton. w
. Diseases of economic plants. Plant diseases. FIBER PLANTS 399 and" die. A single leaf often presents the three conditions, green (healthy), yellow (sick), and brown (dead), side by side in bands, parallel to the main ribs and radiating from the leaf stem. The dead parts may break away, leav- ing the leaf ragged. The upper leaves follow rapidly over the course of the lower leaves. The leaves as soon as badly affected fall away, leaving only a bare stalk. In mild cases,. Fig. 173. — A variety of cotton resistant to the wilt; note the complete failure of the other varieties. After Orton. where the disease runs its course more slowly, the intervals between the different stages are more prolonged. In light sand the disease may progress very rapidly and may con- sist of only two stages, the sudden wilted condition followed by speedy death. The final diagnostic symptom of the dis- ease, however, as in the case of many other wilts, is the darkening of the affected veins, which change from the normal white to light brown or black. Though in most cases the plant dies, occasionally one revives and seems to. 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 Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York, Macmillan
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
