. Diseases of economic plants. Plant diseases. disease in 1902 by Hasselbring, who attributed to it more serious results than from any other canker disease of IlHnois. In many cases large limbs and even whole trees are killed. It has been reported in many states, including Arkansas, Okla- homa, Nebraska, New Hampshire, New York, and Virginia. The cankers are at first in- conspicuous, unhealthy, dirty brown, usually depressed spots in the bark, sometimes 15 cm. in diameter, which enlarge rapidly, particularly lengthwise upon the limb, a crack often marking the boundary between dead and sound ba
. Diseases of economic plants. Plant diseases. disease in 1902 by Hasselbring, who attributed to it more serious results than from any other canker disease of IlHnois. In many cases large limbs and even whole trees are killed. It has been reported in many states, including Arkansas, Okla- homa, Nebraska, New Hampshire, New York, and Virginia. The cankers are at first in- conspicuous, unhealthy, dirty brown, usually depressed spots in the bark, sometimes 15 cm. in diameter, which enlarge rapidly, particularly lengthwise upon the limb, a crack often marking the boundary between dead and sound bark. The interior of the bark of such spots is mottled with dead regions. In autumn the sporiferous bodies appear near the bor- ders of the diseased spots, first pushing through cracks in the bark, and exposing pale grayish ochre-colored fungous growths 3-6 mm. in diam- eter,which, when mature, are slightly saucer-shaped, and dark in color. These bodies are attached to the dead wood, and remain there even after the bark has fallen away, thus constituting a diagnostic character of absolute reliability, separating this from all other cankers. Discoloration of the heartwood often occurs at a distance of a meter or more from the ap- parent seat of disease. When the cankers become large, injury to the distal parts through interruption of the water supply results. The. Fig. 19. — Black-spot on fruit. After 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- [from old catalog]; Hall, John Galentine, 1870- [from old catalog] joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
