. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 47$ FUNGOUS DISEASES OF PLANTS and wild plants. The last-mentioned fungi are at least closely related, perhaps forms of a single species; and in this treatise they are provisionally referred to the genus Corticium. They have been discussed under Corticium vagum B. & C, var. Solani Burt. The writer examined various diseases due to Rhizoctonia while in Europe during 1899 and 1900, and subsequently in the United States. As a result, certain observations may be stated. In the first
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 47$ FUNGOUS DISEASES OF PLANTS and wild plants. The last-mentioned fungi are at least closely related, perhaps forms of a single species; and in this treatise they are provisionally referred to the genus Corticium. They have been discussed under Corticium vagum B. & C, var. Solani Burt. The writer examined various diseases due to Rhizoctonia while in Europe during 1899 and 1900, and subsequently in the United States. As a result, certain observations may be stated. In the first place, the common alfalfa root fungus of Europe {Rhi- zoctonia Medicaginis) is the same as the European root fungus of asparagus (Aspara- gus officinalis). This species also occurs less frequently upon the sugar beet (Beta vulgaris), and, doubtless, upon other cultivated and wild plants. The fungus ap- pears upon the root as a close weft of violet-colored hyphas (Fig. 239), composed of cells more or less uniform in diam- eter, filamentous, branched, but without a particularly characteristic type of branch- ing. Morphologically, it bears no resemblance to the sterile stage of Corticium vagum, above referred to, that is, the form causing the rot of the crocus, and a similar disease of the carrot, etc., in Europe, the rot of beets, stem rot of carna- tions, certain damping-off diseases, etc., in America. Rhizoctonia Medicaginis is not common in America so far as can be ascertained. In Europe it is one of the most destructive. Fig. 239. Rhizoctonia Medicaginis on Roots of Asparagus. 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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