. Diseases of economic plants. Plant diseases. Cereals 287 fungi, and is not cornparable to ordinary molding of dead organic matter by fungi of varying kind. Dry-rot (Diplodia zece (Schw.) Lev. and Diplodia macrospora Earle). — This is one of the very widespread, dry ear rots of corn variously known to growers as mold, mildew, rot, dry-rot, etc. Though the disease is really present soon after silking, and even much earlier from root infection, it is not usually recognized until husking, when a whitish covering of the kernels within the husk is noted. This white mycelium also forms dense masses
. Diseases of economic plants. Plant diseases. Cereals 287 fungi, and is not cornparable to ordinary molding of dead organic matter by fungi of varying kind. Dry-rot (Diplodia zece (Schw.) Lev. and Diplodia macrospora Earle). — This is one of the very widespread, dry ear rots of corn variously known to growers as mold, mildew, rot, dry-rot, etc. Though the disease is really present soon after silking, and even much earlier from root infection, it is not usually recognized until husking, when a whitish covering of the kernels within the husk is noted. This white mycelium also forms dense masses between the indi- vidual grains, among the husks, and over the cob. The grains on the affected ear are shrunken, loosely attached, light in weight, darker in color, and more brittle than those of a healthy ear. Upon breaking open an ear, very small black pycnidia may be seen embedded in the white masses of mycelium, especially at the bases of the kernels. Diseased ears left in the field may develop these pyaii- dia in such abundance as to make the grains black. Much of the food value of the corn is lost, owing to the consumption of starch within the grain, as well as to the pre- vention of starch storage. The germi- nating power of the grain is also lost. Upon the stalks the fungus first appears as very small dark specks under the rind, near the nodes, and at broken places, usually in over-wintered stalks. Three-year-old stalks have been found. 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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