Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 DISEASES OF SPECIAL CROPS 93 apple losses and has been noted in several states, notably Missouri, Nebraska, West Virginia, and North Carolina, in abundance enough to call for printed mention. Brown rot produces complete decay of the affected apples, which turn brown, become soft and wrinkled, and soon show pustules of bushy mycelium breaking through rifts and fissures in the skin over the diseased tissue. The diseased fruits may mummify upon the tree or more fre- quently fall to the ground and th
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 DISEASES OF SPECIAL CROPS 93 apple losses and has been noted in several states, notably Missouri, Nebraska, West Virginia, and North Carolina, in abundance enough to call for printed mention. Brown rot produces complete decay of the affected apples, which turn brown, become soft and wrinkled, and soon show pustules of bushy mycelium breaking through rifts and fissures in the skin over the diseased tissue. The diseased fruits may mummify upon the tree or more fre- quently fall to the ground and there shrivel to dry, hard, wrinkled masses, in which the rot fungus winters. Powdery mildew, Sphser othecose (Sphcerotheca mail (Duby) Burr.).— The general appear- ance of this mildew is much like that described for the grape; that is, the surfaces of the leaves are more or less covered with a white or grayish fungous growth, in the later stages of which are found numerous very small black fruiting bodies approximately mm. in diameter. This fungus, while of comparatively little significance to old apple trees, causes much injury to nursery stock, often be- coming so serious as to prevent successful budding. Mil- dew has been reported as serious in California and other western states, — in Kentucky, Iowa, Washington, and Fig. 37. — Brown rot (sclerotiniose) produced by inoculation. Note the fungus forms the letters A. M. C. Original.
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