. Diseases of economic plants. Plant diseases. Pomaceous Fruits 67 Unless continued, careful inspection is given, and concerted action in a community maintained, but little l^enefit will follow. Rusf*^''*-• ^^'^ {Gymnosyorangium sps., Roestelia). — Rust of pear is very similar in nature to rust of the apple, though less often injurious. It consists of a summer stage and a winter stage. The former produces rust on the leaves of the pear, while the winter stage of the eastern form of rust pro-. FiG. 32. — Scab on California pears bought in Raleigh, N. C. Original. duces the familiar cedar-apple
. Diseases of economic plants. Plant diseases. Pomaceous Fruits 67 Unless continued, careful inspection is given, and concerted action in a community maintained, but little l^enefit will follow. Rusf*^''*-• ^^'^ {Gymnosyorangium sps., Roestelia). — Rust of pear is very similar in nature to rust of the apple, though less often injurious. It consists of a summer stage and a winter stage. The former produces rust on the leaves of the pear, while the winter stage of the eastern form of rust pro-. FiG. 32. — Scab on California pears bought in Raleigh, N. C. Original. duces the familiar cedar-apple upon the cedar tree. The pear rust of the West is a distinct species, with the incense cedar as the alternate host. The remedy, as in the case of the apple, consists in re- moving all red cedar trees from the neighborhood of the pear orchard; thus eliminating the source of infection. When this is impossible, the pear trees should be sprayed with Bordeaux mixture immediately after the early rains which cause the gelatinous horns to emerge on the cedar- apple, and thus furnish the of spores for the spring infection. This disease of pears is particularly abundant upon varieties of the Japanese strain. Powdery-mildews. See 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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