. Diseases of economic plants . Plant diseases. 302 DISEASES OF ECONOMIC PLANTS more advanced stages, or in sections taken lower on the stem, the wood is found to be penetrated longitudinally by black streaks which are so abundant in stages immediately preceding death that the whole or nearly all of the wood seems to be so affected. Simi- lar streaks pene- trate the pith only in extreme cases. The blackening often progresses from the wood out- ward through the bark, produciiig shrunken, black- ened patches on the surface of the stem. In more ad- vanced stages, when all the leaves are wilting,
. Diseases of economic plants . Plant diseases. 302 DISEASES OF ECONOMIC PLANTS more advanced stages, or in sections taken lower on the stem, the wood is found to be penetrated longitudinally by black streaks which are so abundant in stages immediately preceding death that the whole or nearly all of the wood seems to be so affected. Simi- lar streaks pene- trate the pith only in extreme cases. The blackening often progresses from the wood out- ward through the bark, produciiig shrunken, black- ened patches on the surface of the stem. In more ad- vanced stages, when all the leaves are wilting, the wood and bark at the base of the plant are blackened almost throughout, and the pith is decayed, leaving the stem hollow or filled with a soft, rotten residue. The bark, near the level of the ground, turns black, and becomes dry and hard. The pith and wood in the upper portions of the plant usually dry up,. Fig. 132. — Tobacco plant in late stages of the Gran- ville wilt. 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
Size: 1295px × 1930px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
