. Agricultural bacteriology; a study of the relation of germ life to the farm, with laboratory experiments for students, microorganisms of soil, fertilizers, sewage, water, dairy products, miscellaneous farm products and of diseases of animals and plants. Bacteriology, Agricultural. OTHER BACTERIA DISEASES OF PLANTS 329 demonstrated to be a bacterial disease. Tbe bacillus is a motile one with several flagella at one end and grows in ordinary culture media in the laboratory. Several different bacteria have been found associated with this disease, but the one to which the above name has been giv
. Agricultural bacteriology; a study of the relation of germ life to the farm, with laboratory experiments for students, microorganisms of soil, fertilizers, sewage, water, dairy products, miscellaneous farm products and of diseases of animals and plants. Bacteriology, Agricultural. OTHER BACTERIA DISEASES OF PLANTS 329 demonstrated to be a bacterial disease. Tbe bacillus is a motile one with several flagella at one end and grows in ordinary culture media in the laboratory. Several different bacteria have been found associated with this disease, but the one to which the above name has been given is its cause, as shown by the fact that the inoculation of olive trees with cultures of the organism is invariably followed by the appearance of the characteristic symptoms of the disease at the point inoculated. The effect of the bacillus is to stimulate the plants to unusual growth. The various tissues of the stem multiply more pro- fusely than common, producing a swollen growth on the stem which is called the olive knot (Fig. 53). This injures the trees and sometimes kills them. The organism, so far as known, enters the plant exclusively through wounds. It occurs in the various olive-raising countries of Europe and Africa, and also in Cali- fornia. The Crown Gall oj the Peach and Other Plants (J5. iumefaciens),—This disease, until recently attributed to a different class of fungi, has now been proved to be caused by a bacterium. In the peach it commonly produces an enlarged growth at the crown of the plant, between the stem and the root. The parasite that causes it has the power of growing upon a large series of plants, producing tumors in various parts of the plant which injure it more or less, according to the extent of the infection. Among the plants that may be infected with it are the rasplerry (Fig. 54), the daisy, the hop, the radish, the cabbage, the tobacco, the sugar beet, the grape, the tomato, the oleander, the apple, and some others* It is unusual for a par
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteriologyagricult
