. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 2^4 REMEDIES arc still commonly attacked, they do not appear to suffer appreciably. Artificial co)iirol of fmigal diseases is accomplished by diverse means, but in each case success depends upon a knowledge of the life-history of the parasite. The method of treatment varies according as the parasite attacks the overground or underground organs of the host. Several of the Fungi considered in the last chapter { Potato Blight) afford instances of the former mode of attack. Diseases of the subter- ranean part
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 2^4 REMEDIES arc still commonly attacked, they do not appear to suffer appreciably. Artificial co)iirol of fmigal diseases is accomplished by diverse means, but in each case success depends upon a knowledge of the life-history of the parasite. The method of treatment varies according as the parasite attacks the overground or underground organs of the host. Several of the Fungi considered in the last chapter { Potato Blight) afford instances of the former mode of attack. Diseases of the subter- ranean parts are exempli- fied by the pernicious Wart Disease of the Potato, due to a lowly Fungus of a peculiar kind, and that known as Finger and Toe (Fig. 135 and p. 251), which attacks Turnips, Cabbages, etc., causing irregular swellings upon the root- system. One of the remedies most commonly employed against Fungi infesting the overground parts is spray- ing with a fungicide which, while deleterious to the parasite, leaves the host practically unharmed. For this purpose Bordeaux mixture, consisting of a solution of copper sulphate and slaked lime, is one of the most popular. Where the disease is subter- ranean, application of unslaked lime is often successful, as, for instance, in the case of Finger and Toe. Such diseases are, however, far more difficult to eradicate than those which develop overground. They are often best counteracted by growing only such crops, in the infected soil, for several seasons in succession, as are not attacked b\' the parasite in Fig. 135.—Brussels Sprouts attacked by " Finger and Toe " [Plasmodio- phora brassicie.) [Photo : E. J. S.]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. Lon
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
