. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 179 characteristic white hyphse and spores tinged with purple may be seen on the under sides of the older spots. The disease progresses to the younger leaves, slowly in dry or cool weather, but very rapidly in warm, wet weather. The field is soon reduced to a mass of dry, dead Fig. 97. — Spots of downy-mildew upon cucumber leaf. After Orton. The mildew was first described in 1868 from Cuba. In 1889 it attracted attention in the United States (New Jersey, Florida, and Texas) and in Japan. Since that time it has be
. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 179 characteristic white hyphse and spores tinged with purple may be seen on the under sides of the older spots. The disease progresses to the younger leaves, slowly in dry or cool weather, but very rapidly in warm, wet weather. The field is soon reduced to a mass of dry, dead Fig. 97. — Spots of downy-mildew upon cucumber leaf. After Orton. The mildew was first described in 1868 from Cuba. In 1889 it attracted attention in the United States (New Jersey, Florida, and Texas) and in Japan. Since that time it has been destructive in many states. The loss in Wayne County, Ohio, alone was estimated at $45,000 in one season. It grows upon muskmelons and cucumbers in most de- structive form and is less injurious to squash, pumpkin,. 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
