. Diseases of economic plants . Plant diseases. 474 DISEASES OF ECONOMIC PLANTS nearly so. The larger spots are a centimeter or more in diameter, and they frequently coalesce so as to nearly cover whole leaflets. With age the spots turn gray at the centers, at which part the leaf dies. They also become more regular in outline. Fig. 201. — Rose mildew ; diseased and healthy shoots. Original. than in their earlier stages. Portions of the leaflets out- side of the area actually spotted often turn yellow, and the diseased leaflets fall off prematurely. Thus the beds be- neath diseased plants are o
. Diseases of economic plants . Plant diseases. 474 DISEASES OF ECONOMIC PLANTS nearly so. The larger spots are a centimeter or more in diameter, and they frequently coalesce so as to nearly cover whole leaflets. With age the spots turn gray at the centers, at which part the leaf dies. They also become more regular in outline. Fig. 201. — Rose mildew ; diseased and healthy shoots. Original. than in their earlier stages. Portions of the leaflets out- side of the area actually spotted often turn yellow, and the diseased leaflets fall off prematurely. Thus the beds be- neath diseased plants are often strewn with fallen leaves. All infective material should be gathered and burned, and both bushes and ground be well cleared of superficial spores. 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
