. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 486 SPECIAL PLANT PATHOLOGY A stem section shows a browning of the vascular ring and the vessels are found occupied by bacteria (Fig. i68). When the cabbage plant is attacked early in the season, it is killed outright, or else it fails to form the characteristic head. Infections may take place through injury of the surface, but the greater part of them are through the water pores, which exude drops of water, which collect during cool. Fig. i68.—Brown-rot of turnip {Pseudomonas brassica)
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 486 SPECIAL PLANT PATHOLOGY A stem section shows a browning of the vascular ring and the vessels are found occupied by bacteria (Fig. i68). When the cabbage plant is attacked early in the season, it is killed outright, or else it fails to form the characteristic head. Infections may take place through injury of the surface, but the greater part of them are through the water pores, which exude drops of water, which collect during cool. Fig. i68.—Brown-rot of turnip {Pseudomonas brassica). Cross-section from middle of turnip root showing small bundle fully occupied by the bacterial organism. (After Smith, E. P., Bull. 29, U. S. Bureau of Plant Industry, Jan. 17, 1903.) nights, and in natural infectioii slugs are responsible carriers of the organism. Russell has found that the cauhflower is the most susceptible plant, while turnips and rutabagas are not very susceptible. Edwards reports that the Houser cabbage is practically immune to black-rot under field conditions. The period of incubation is variable. In some cases with needle punctures, the first signs of the disease appear in seven to. 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 Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
