. Diseases of economic plants . Plant diseases. U-2 DISEASES OF ECONOMIC PLANTS MAPLE Leaf spot, phyllostictose {Phyllosticta acericola C. & E.)- — A large proportion of the leaf may become involved, causing premature defoliation which materially lessens the. Fig. 193. — Maple tar spot. After Heald. value of the tree for ornament or shade. The silver maples are especially susceptible, and their sale has thereby been reduced. The leaf spot was first noted in 1874 and is dis- tributed throughout the United States. The blackish, subcircular spots as they enlarge change to brown and later. Ple
. Diseases of economic plants . Plant diseases. U-2 DISEASES OF ECONOMIC PLANTS MAPLE Leaf spot, phyllostictose {Phyllosticta acericola C. & E.)- — A large proportion of the leaf may become involved, causing premature defoliation which materially lessens the. Fig. 193. — Maple tar spot. After Heald. value of the tree for ornament or shade. The silver maples are especially susceptible, and their sale has thereby been reduced. The leaf spot was first noted in 1874 and is dis- tributed throughout the United States. The blackish, subcircular spots as they enlarge change to brown and later. 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
