. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 243 and the presence of pale bleached spots upon the foliage. These spots are not definitely limited, nor does the tissue die as it does in the case of other spinach leaf spots. Black-mold {Cladosporium macrocarpum Preuss) develops primarily upon old leaves, and renders the plant unsalable. The spots are distinguishable from all other spinach spot diseases by their irregularity, indefiniteness, and color. To control the three latter spinach diseases, it is well to burn diseased refuse, practice rotation, and employ preven
. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 243 and the presence of pale bleached spots upon the foliage. These spots are not definitely limited, nor does the tissue die as it does in the case of other spinach leaf spots. Black-mold {Cladosporium macrocarpum Preuss) develops primarily upon old leaves, and renders the plant unsalable. The spots are distinguishable from all other spinach spot diseases by their irregularity, indefiniteness, and color. To control the three latter spinach diseases, it is well to burn diseased refuse, practice rotation, and employ preventive sprays when the plants are young. Spraying the edible leaves as the plants approach maturity injures the sale and is not permissible. Leaf-spot (Heterosporium va- riabile Cke.). —This disease was especially injurious to spinach in eastern Virginia during the win- ter of 1908-1909, and has also been noted in Connecticut. It appears early in January and continues to increase until the spinach season is over. Numer- ous leaf spots are produced, at first brown, later sooty, as the conidiophores and conidia of the fungus develop. The older leaves usually show more injury than the younger, but at times all leaves are seriously affected. The presence of the fungus renders the leaves unsalable, and much additional labor is required at harvest time to trim off the injured leaves. The disease does not seem capable of attacking healthy, vigorous plants, but usually follows injuries produced by some other agencies. In Virginia it has been found to follow. Fig. 133. — Spinach leaf spotted by Heterosporium. After 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
