. Diseases of economic plants. Plant diseases. 78 Diseases of Economic Plants vents either the growth of the seedUng or successful budding or grafting. On old leaves, though often abundant, the fungus does not cause great damage, but when the attack is made on young growing tips, or on young leaves, these delicate structures suffer greatly from loss of nourishment. The disease is com- mon from the Atlantic to the Pacific. Unlike most fungi the mildew grows best during fair, dry weather. A light rain, which spreads the spores and furnishes sufficient moisture for germi- nation, followed by a dr
. Diseases of economic plants. Plant diseases. 78 Diseases of Economic Plants vents either the growth of the seedUng or successful budding or grafting. On old leaves, though often abundant, the fungus does not cause great damage, but when the attack is made on young growing tips, or on young leaves, these delicate structures suffer greatly from loss of nourishment. The disease is com- mon from the Atlantic to the Pacific. Unlike most fungi the mildew grows best during fair, dry weather. A light rain, which spreads the spores and furnishes sufficient moisture for germi- nation, followed by a dry spell, best favors the development of powdery- mildew. The use of Bordeaux mixture, sulfur dust, or lime-sulfur has proved satisfac- tory. Apply about every ten days dur- ing the early growing season; more frequently, if necessary to replace the poison washed off by rain. Wood-rot ^^ {Schizophyllum alneum (L.) Schr.). — Small white specks, the sporophores, appear upon the limbs and trunk in early summer. In the autumn they are well developed and abundant; white and very hairy, 1-3 cm. in diameter, usually attached on one side with the margins incurved. The gills are white, woolly, branched, deeply split along the edge, and revolute. The affected wood is brittle and pene- trated by black lines. Apparently this disease starts in roots injured by tools during cultivation or in wounds upon Fig. 39. — Schizo- phyllum alneum, frequently the causal fungus of wood-rot of cherry and other trees. After Atkinson. Minor diseases Die-back ^^ (Valsa leucostoma, Cystospora). — The discus- sion of die-back on p. 86 is applicable in this connection. The disease is common on the cherry in the United States. 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- [from old catalog]; Hall,
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