. 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, and a synopsis of the vegetable kingdom. Gardening -- Dictionaries; Plants -- North America encyclopedias. 496 DISEASES DISPORUM to l^e oue of this class, and is as iateres-ting to the vege- table pathologist as it is destructive to the orchardist. The latest view of this particular form of disorder is that of the uuorgani
. 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, and a synopsis of the vegetable kingdom. Gardening -- Dictionaries; Plants -- North America encyclopedias. 496 DISEASES DISPORUM to l^e oue of this class, and is as iateres-ting to the vege- table pathologist as it is destructive to the orchardist. The latest view of this particular form of disorder is that of the uuorganized ferment, which by causing cer- tain chemical changes in the substances of the cells brings about the peculiar and well marked malady of the " yel- ; If we start with the premise that there is a cer- tain small amount of chemical ferment in all plants, it is only necessary to have this increased to get the re- sults in question; and how to prevent this augmentation is the practical point at issue. This ferment in active form might be communicated from one plant to another by budding or grafting, and, instead of introducing liv- ing germs, it is a transmission of a germless ferment like diastase, that is found in seeds, and does its ap- pointed work as a solvent, in the period of germination. There are other disorders that are called " (Edema," or a dropsical form of disease. The tomato ia subject to this, and pelargoniums likewise. Tumors are formed, or the leaves bear translucent dots along the veins. This trouble is most apt to appear with greenhouse plants in early spring, and may be favored by lack of sun- shine, especially if the warm soil is wet and root action is excessive. The remedy lies in furnishing, so far as. 727, A blight of gfrapes due to some constitutional disorde Notice that the leaves die first at the edges (X H). possible, the conditions opposite to those above named. In general, it may be said that diseases which are due to germs
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