. Diseases of economic plants. Plant diseases. 14 DISEASES OF ECONOMIC PLANTS The California vine disease in 1892, $10,000,000. Pierce. Wheat rust in the United States, 1898, $67,000,000. Galloway. Wheat rust in Illinois, 1885, $1,875,000. Burrill. Violet, leaf spot in the United States, 1900, $200,000. Dorsett. Peach leaf curl in the United States, 1900, $2,335,000. Pierce. Potato late blight in New York, 1904, $10,000,000. Stewart. Oat smut in the United States, annual, $6,500,000. Orton. Wheat loose smut, United States, annual, $3,000,000. Orton. Wheat bunt in the United States, annual, $11
. Diseases of economic plants. Plant diseases. 14 DISEASES OF ECONOMIC PLANTS The California vine disease in 1892, $10,000,000. Pierce. Wheat rust in the United States, 1898, $67,000,000. Galloway. Wheat rust in Illinois, 1885, $1,875,000. Burrill. Violet, leaf spot in the United States, 1900, $200,000. Dorsett. Peach leaf curl in the United States, 1900, $2,335,000. Pierce. Potato late blight in New York, 1904, $10,000,000. Stewart. Oat smut in the United States, annual, $6,500,000. Orton. Wheat loose smut, United States, annual, $3,000,000. Orton. Wheat bunt in the United States, annual, $11,000,000. Orton. Potato blight in the United States, annual, $36,000,000. Orton. SYMPTOMS OF DISEASE Every part of a plant — root, stem, leaf, flower, fruit, bark, wood, veins — is subject to disease, and the same disease may be mani- fest in many, even all, of these parts at once. Rot is perhaps the most common symptom of disease to be noted in any plant part. Rot is of many characters, — soft, wet, dry, hard, offensive or inoffensive of odor. Blight is a symptom often exhibited by leaves, roots, stems, flowers, or fruit. It indi- cates complete death of the part affected, may be. Fig. 3. — Cowpea leaf spot (amerosporiose). Pycnidia scattered throughout, x 4. 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- joint author. New York, The Macmillan Company
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