. Diseases of economic plants . Plant diseases. 76 DISEASES OF ECONOMIC PLANTS ment of fruit, injury to sale of fruit, injury to keeping quality of fruit. Snow, Spitzenburg, Maiden Blush, Greening, and Twenty Ounce are more susceptible than Baldwin, while Golden Russet and Hubbards- ton are among the most resistant vari- eties. The spray recom- mended on page 100 will to a very large extent prevent the apple scab. It is es- pecially important to apply the mixture at just the dates indi- cated, just before the blossoms open, again just after the petals fall, followed by one or two more spr
. Diseases of economic plants . Plant diseases. 76 DISEASES OF ECONOMIC PLANTS ment of fruit, injury to sale of fruit, injury to keeping quality of fruit. Snow, Spitzenburg, Maiden Blush, Greening, and Twenty Ounce are more susceptible than Baldwin, while Golden Russet and Hubbards- ton are among the most resistant vari- eties. The spray recom- mended on page 100 will to a very large extent prevent the apple scab. It is es- pecially important to apply the mixture at just the dates indi- cated, just before the blossoms open, again just after the petals fall, followed by one or two more sprayings later. Blotch {Phyllosticta solitaria Ell. & Ev.). — In some sections of this countrj^ this disease of bark, leaf, and fruit is even more troublesome than any of the preceding, though its distinct identity was not recognized until 1897, when the first specimens came from Maryland and Texas. Since then the disease has been frequently seen in the eastern part of the United States though not as a very serious pest. Its most destructive center heretofore has been in the Ozarks of Arkansas and Missouri, where 75 per cent of the crop is commonly rendered unfit for barrel-. FlG. 26.—Apple blotch (phyllostictose). Scott and Rorer. 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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