. Diseases of economic plants. Plant diseases. Cereals 293 but it is hardly probable that this disease will extend seriously or become very destructive, except locally, and in very humid, hot seasons. In some cases, the injury is as high as 6 to 10 per cent of the crop. The fungus grows in leaf, sheath, and stem, rarely in the husks. Bleached or yellow spots about 1 mm. in diameter first appear, and within a few days darken, eventually becoming reddish-brown. Coales-. FiG. 154. — Map showing the distribution of Physo- derma zeae-maydis in the United States. Broken lines, P. zeae-maydis present
. Diseases of economic plants. Plant diseases. Cereals 293 but it is hardly probable that this disease will extend seriously or become very destructive, except locally, and in very humid, hot seasons. In some cases, the injury is as high as 6 to 10 per cent of the crop. The fungus grows in leaf, sheath, and stem, rarely in the husks. Bleached or yellow spots about 1 mm. in diameter first appear, and within a few days darken, eventually becoming reddish-brown. Coales-. FiG. 154. — Map showing the distribution of Physo- derma zeae-maydis in the United States. Broken lines, P. zeae-maydis present: solid line, P. zese-maydis caus- ing damage. After Tisdale. cence of many spots may lead to discoloration of large areas and a rusted appearance. These diseased areas are often in bands across the leaf. Leaves are often killed. The dry epidermis eventually ruptures over diseased spots and the dusty, brown spores are freed. Diseased stems break easily, resulting in considerable lodging of the corn. General san- itary measures are recommended, chiefly destruction of in- fested refuse and rotation of 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, bookdecade1920, bookyear1921
