. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 721 Colony of apple-scab. Natural size. DISEASES cherry tree. The limbs affected are practically worth- less, and by destroying them the disease is kept from spreading further in the branch and the forming spores are destroyed before they have an opportunity of get- ting a foothold elsewhere. ^ If the horticult
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 721 Colony of apple-scab. Natural size. DISEASES cherry tree. The limbs affected are practically worth- less, and by destroying them the disease is kept from spreading further in the branch and the forming spores are destroyed before they have an opportunity of get- ting a foothold elsewhere. ^ If the horticulturistunderstands the methods of growth and propagation of a destructive fungus, he is better able to take the step that may lead to the eradication of the pest. Let another example ,,â :;;â >;_, be taken, namely, the apple- ' "⢠⢠' â â 'â '' leaf rust, which in some parts of the country is a serious ^ menace to the orchardist. It < is recognized as yellow 4 blotches upon the foliage, fol- â _, lowed by groups of deep cups ;: in the under half of the leaf tissue, where orange-colored spores are produced in great abundance. The life cycle of this fungus, Gymnosporan- gium macropus, involves two hosts; that is, it lives in one stage upon the common red cedar and in the next it infests the apple tree. Upon the cedar the fungus, forms galls of a chocolate color half an inch or more in diameter which during the spring rains become swollen and have a gelatinous exterior. In this .I'elly the spores are pro- duced that find their way to the apple tree and there form, after vegetating for a few days, the destructive rust. It is seen that in a case like this the most impor- tant thing is to destroy the cedar-galls, for in them the fungus passes the winter; and this can be done by picking and burning. To those who do not set a high value upon their cedar trees, the end may be accomplished by removing the cedar trees that stand at all near the infested orchard. But t
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