. Textbook of botany. Botany. PLANT DISEASES 381 outer cells have been killed by the fungus so that it is easy for decay-producing fungi to enter. The fungous body is very much like that of the downy mildew fungus, excepting that the short branches that enter the host cells are also thread-like and much more delicate than the main branches. The spores also are very much like those of the downy mil- dew fungus, and the large, thick-walled zygotes are very rarely found. The disease may be kept under control by the use of the Bordeaux mixture, making from three to five applications at intervals o
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. Textbook of botany. Botany. PLANT DISEASES 381 outer cells have been killed by the fungus so that it is easy for decay-producing fungi to enter. The fungous body is very much like that of the downy mildew fungus, excepting that the short branches that enter the host cells are also thread-like and much more delicate than the main branches. The spores also are very much like those of the downy mil- dew fungus, and the large, thick-walled zygotes are very rarely found. The disease may be kept under control by the use of the Bordeaux mixture, making from three to five applications at intervals of about two weeks. Some varieties of potato seem to be more resistant than others, but their resistance appears to depend partly upon conditions in the locality in which they are grown, because potatoes de- scribed as resistant in one region may prove very susceptible in an- other. 385. Brown Rot. — This disease attacks the peach, plum, cherry, apricot, and related plants. The damage done by the brown rot fungus (one of the sac fungi) is enormous, a con- servative estimate plac- ing the annual loss in past years at over $5, 000, 000. It usually attacks the fruit, but may cause damage to flowers, leaves, and small branches. On the fruit, the disease first appears as a small, dark, decayed spot which gradually enlarges until it covers perhaps the. Fig. 216. —A branch bearing peaches afiected by the brown rot.. 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 work.. Allen, Charles E. (Charles Elmer), b. 1872; Gilbert, Edward Martinius, joint author. Boston, New York [etc. ] D. C. Heath & co