. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . 2. FIO. 20. APPLE , Cluster cups on under surface of leaf; 2, spores; 3, spores germinating. develop and produce the aj^ple rust. The affected aj^j^leloaf has scurfy bunches on the under surface, the areaon the upper surface above these becoming orange-yel-low, or sometimes almost crimson, in color. As thedisease progresses the leaf becomes more and more dis-torted, and in case the injury affects a large proportionof the leaves serious damage to the
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . 2. FIO. 20. APPLE , Cluster cups on under surface of leaf; 2, spores; 3, spores germinating. develop and produce the aj^ple rust. The affected aj^j^leloaf has scurfy bunches on the under surface, the areaon the upper surface above these becoming orange-yel-low, or sometimes almost crimson, in color. As thedisease progresses the leaf becomes more and more dis-torted, and in case the injury affects a large proportionof the leaves serious damage to the tree may result. The spores are produced in great numbers on theorange-yellow areas of the aj^ple leaf, and are blown THE APPLE TWIG BLIGHT 39 iiwaj by the wind. Tliose which light upon red cedar,under favorable conditions, may develop, and by sodoing carry the disease back to the original host there is a continual alternation of the generationsof the funous. The form of the fungus which occurs upon apples iscommonly called the Rmstelia form. Besides the dis-colored areas on the upper surface of the leaf, the pecu-liar ^^c
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
