Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 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, Wealthy, 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, Twenty- ounce Pippin, and Yellow Transparent as less suscep- tible, while the Northern Spy, Waxen, and
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 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, Wealthy, 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, Twenty- 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. When the cankers are few, on small trees, excision may be practiced to advan- tage; when, however, there are hundreds of cankers upon each tree, this treatment is manifestly impracticable. Spraying with 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 Lawrence.
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