. Diseases of economic plants . Plant diseases. DISEASES OF SPECIAL CROPS 85 lar to those upon the bark soon develop in concentric circles. Lawrence notes the Baldwin, Blue Pearmain, Grav- enstein, Newton Pippin, Wagener, \\'oalthy, and Yellow Bellflower as espe- cially susceptible; the Hubbardston, Nonesuch, Imperial Pippin, King of Tompkins County, Maiden Blush, Olympic, Red As- trachan, Rhode Island Greening, Spitzenburg, Striped Astrachan, Twcnij-- ounce Pippin, and Yellow Transparent as less suscep- tible, while the Northern Spy, Waxen, and Ben Davis are comparatively free from the diseas
. Diseases of economic plants . Plant diseases. DISEASES OF SPECIAL CROPS 85 lar to those upon the bark soon develop in concentric circles. Lawrence notes the Baldwin, Blue Pearmain, Grav- enstein, Newton Pippin, Wagener, \\'oalthy, and Yellow Bellflower as espe- cially susceptible; the Hubbardston, Nonesuch, Imperial Pippin, King of Tompkins County, Maiden Blush, Olympic, Red As- trachan, Rhode Island Greening, Spitzenburg, Striped Astrachan, Twcnij-- ounce Pippin, and Yellow Transparent as less suscep- tible, while the Northern Spy, Waxen, and Ben Davis are comparatively free from the disease; but these generalizations are largely modified by a great variation in resistance among individual trees. Wlien the cankers are few, on small trees, excision may be practiced to advan- tage; when, liowever, there are hundreds of canliers upon each tree, this treatment is manifestly impractical)le. Spraying witli strong Bordeaux mixture, 12-8-50, in the fall after the crop is gathered is valuable to prevent the. Fig. 32. —Black spot on fruit. 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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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
