Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 442 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 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, sub circular spots as they e

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Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 442 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 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, sub circular spots as they enlarge change to brown and later

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