. Diseases of economic plants . Plant diseases. 122 DISEASES OF ECONOMIC PLANTS recognize it easily. It first appears as small, circular, brown, decayed spots. These rapidly enlarge until they embrace the whole fruit, which at the same time shrinks shghtly. As the decay advances, small tufts of brown threads appear near the centers of the original spots, and spread rapidly until the whole fruit is covered with them. If the fruit hangs in clusters, adjacent fruits begin to decay at the points of contact, and the disease spreads from fruit to fruit until whole clus- ters are lost. Fruit, after i
. Diseases of economic plants . Plant diseases. 122 DISEASES OF ECONOMIC PLANTS recognize it easily. It first appears as small, circular, brown, decayed spots. These rapidly enlarge until they embrace the whole fruit, which at the same time shrinks shghtly. As the decay advances, small tufts of brown threads appear near the centers of the original spots, and spread rapidly until the whole fruit is covered with them. If the fruit hangs in clusters, adjacent fruits begin to decay at the points of contact, and the disease spreads from fruit to fruit until whole clus- ters are lost. Fruit, after it is picked, may also succumb to attack, and peaches that were apparently sound at pick- ing may be seriously damaged when they reach market. Thus the loss falls upon grower, dealer, and consumer. The decay is so rapid that infection to-day may mean a totally un- salable peach two days hence. Peaches diseased on the tree may fall to the ground, or remain on the tree, where they shrivel and hang over winter, to constitute the " mummy " peaches so familiar in infected orchards. Upon the blossom the disease is first evident as a slight brownish discoloration which spreads rapidly, causing the flower to wither and eventually fall off as a rotten mass, carrying contagion to everything in its path. This damage to the flower is often confounded with frost effects. From the flower the rot may spread to adjacent twigs, through. Fig. 55. — Mummy peach showing Sclerotinia ascophores. After 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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