. Diseases of economic plants. Plant diseases. DISEASES OF SPECIAL CROPS 75 Upon the leaves and twigs the fungus forms a thick velvety coat, varying from dark olive-green to black, in spots at first circular in. outline, later irregular and coalesc-. Fig. 25.—Apple scab. After Craig. ing. The irritation and retardation of growth caused by the presence of the fungus induces the leaves to curl and wrinkle in a characteristic manner. The injuries by this disease may be enumerated as follows: lessened leaf value, retarded twig and wood growth, premature fall of fruit, retardation of full develop-.
. Diseases of economic plants. Plant diseases. DISEASES OF SPECIAL CROPS 75 Upon the leaves and twigs the fungus forms a thick velvety coat, varying from dark olive-green to black, in spots at first circular in. outline, later irregular and coalesc-. Fig. 25.—Apple scab. After Craig. ing. The irritation and retardation of growth caused by the presence of the fungus induces the leaves to curl and wrinkle in a characteristic manner. The injuries by this disease may be enumerated as follows: lessened leaf value, retarded twig and wood growth, premature fall of fruit, retardation of full develop-. 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- joint author. New York, The Macmillan Company
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
