. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 211 Host Plants. The following is a list of the natural hosts, as compiled by Clinton: Ginseng, Aralia quinquefolia ; Begonia rubra; Begonia sp.; horse radish, Cochlearia Armoracia; Cycla- men sp.; lupines, Lupinus albus, Lupinus angustifolius, Lnpinus lutens, and Lupinus thermis; Nemophila auriculata; tobacco, Nicotiana Tabacum; Onobrychis Cristagalli; pea, Pisum sa- tivum ; Trigonella ccerulea; and violet, Viola odorata. It is therefore evident that a variety of dicot
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 211 Host Plants. The following is a list of the natural hosts, as compiled by Clinton: Ginseng, Aralia quinquefolia ; Begonia rubra; Begonia sp.; horse radish, Cochlearia Armoracia; Cycla- men sp.; lupines, Lupinus albus, Lupinus angustifolius, Lnpinus lutens, and Lupinus thermis; Nemophila auriculata; tobacco, Nicotiana Tabacum; Onobrychis Cristagalli; pea, Pisum sa- tivum ; Trigonella ccerulea; and violet, Viola odorata. It is therefore evident that a variety of dicotyledonous plants may. Fig. 82. The Thielavia Disease of Tobacco. (After G. P. Clinton) Healthy and diseased root systems be attacked. The leguminous hosts are, however, most numerous, and the fungus is quite frequent on garden and sweet peas. Pathological effects. Roots affected by the Thielavia do not develop a normal root system, or they may be injured to such an extent that on pulling up an affected plant from a moist soil practically everything except a stub of a root will be broken off. In the case of the tobacco a cluster of new roots may form on the crown above the first injuries (Fig. 82). The fungus is ap- parently most injurious in the seed beds. Affected plants may not be killed, and many go through the season with a stunted growth, or with such a check upon vigorous development at the. 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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