. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 185 If melons be repeatedly grown upon the same field, the disease increases year by year; hence rotation should be practiced, and resistant varieties should be used. A promis- ing resistant variety has been reported by Blinn. Spraying as recommended for cucurbits generally is effective. Southern-blight {Sderotium rolfsii Sacc). — A large per- centage of the muskmelon and watermelon crops in the. Fig. 101. — Muskmelon leaf spotted with downy-mildew. Original. southernmost states is often destroyed by this disease. It is p
. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 185 If melons be repeatedly grown upon the same field, the disease increases year by year; hence rotation should be practiced, and resistant varieties should be used. A promis- ing resistant variety has been reported by Blinn. Spraying as recommended for cucurbits generally is effective. Southern-blight {Sderotium rolfsii Sacc). — A large per- centage of the muskmelon and watermelon crops in the. Fig. 101. — Muskmelon leaf spotted with downy-mildew. Original. southernmost states is often destroyed by this disease. It is particularly noticeable on fruit upon the side touching the ground, first as a slight rot (ground-rot), followed by a white fringe of fungous threads which soon surround the whole fruit. Later sclerotia appear as smaU round bodies, dirty white to dark brown. For further description and treatment, see pepper. Angular leaf-spot ^^^' ^^^' '^^ (Pseudomonas lachrymans (S. & B.). — This disease is now known in many of the eastern. 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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