. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. LEGUMINOUS CROPS. 15 that these swellings were the storehouses for nitrogenous compounds—these compounds being subsequently used up in the ripening of the seed. But it has been shown by- subsequent research that Tschirch's idea is erroneous, and that these root-nodules are pathological or disease struc- tures, caused by a microscopic fungus whose spores are, at times, found in cultivated soils. During the seasons of 1886 and 1887, field and garden beans were attacked, more or l
. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. LEGUMINOUS CROPS. 15 that these swellings were the storehouses for nitrogenous compounds—these compounds being subsequently used up in the ripening of the seed. But it has been shown by- subsequent research that Tschirch's idea is erroneous, and that these root-nodules are pathological or disease struc- tures, caused by a microscopic fungus whose spores are, at times, found in cultivated soils. During the seasons of 1886 and 1887, field and garden beans were attacked, more or less, by a fungus which ^&« Fig. 3.—Roots of Bkoad Beans, (Kicia/aba) infested with a fungas causiog nodular ont-growths. caused nodular out-growths upon the roots, and thereby caused great injury to the crop (Fig. 3). In the neighbourhood of Etton, near Peterborough, the crops of winter beans were, during 1887, a complete failure. Mr. G. W. Edgson (a well-known farmer) of Etton sent the author a number of these bean plants for inspection. They were about seven inches long. Mr. Edgson wrote as follows : " The roots of the winter beans, you will find, are cove/ed with small boils, which appear to be living upon the plant, and have kept the bean plants in the stage you now see them. For the last few. 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 Griffiths, A. B. (Arthur Bower), 1859-. London : G. Bell
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