. Diseases of economic plants. Plant diseases. Ornamental Plants 431 the leaf dies. They also become more regular in outline than in their earlier stages. Portions of the leaflets outside of the area actually spotted often turn yellow, and the diseased leaflets fall off prematurely. Thus the beds beneath diseased plants are often strewn with fallen leaves. All infective material should be gathered and burned, and by use of a good dormant spray both bushes and ground be. Fig. 220. — Rose mildew; diseased and healthy shoots. well cleared of superficial spores. Ammoniacal copper car- bonate used
. Diseases of economic plants. Plant diseases. Ornamental Plants 431 the leaf dies. They also become more regular in outline than in their earlier stages. Portions of the leaflets outside of the area actually spotted often turn yellow, and the diseased leaflets fall off prematurely. Thus the beds beneath diseased plants are often strewn with fallen leaves. All infective material should be gathered and burned, and by use of a good dormant spray both bushes and ground be. Fig. 220. — Rose mildew; diseased and healthy shoots. well cleared of superficial spores. Ammoniacal copper car- bonate used once each week is effective after the plants are in foliage. Lime-sulfur or Bordeaux mixture may be used when the residue on the foliage is not objectionable. Powdery-mildew {Sphcerotheca pannosa (Wallr.) Lev. or S. humili (DC.) Burr, Oidium). — This is perhaps the most wide-spread and destructive of all rose diseases both under glass and in the open, being especially destructive to the. 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- [from old catalog]; Hall, John Galentine, 1870- [from old catalog] joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
