. Bacteria in relation to plant diseases. Bacteria; Plant diseases. Fig. 120.*. Fig. Agar.—Like Bacterium solanacearum (see pi. 23) agar at 250 C. to 300 C. do not develop rapidly. Fig. 1224 Colonies on plates of +15 standard nutrient They are not visible the first day and often not *Fig. 120.—Cross-sections of base of petiole of inoculated tobacco plant No. 34, showing blackened vascular bundles. These were occupied by the bacteria. Surface of the petiole and midrib sound. The infection entered the leaf from the stem, which was the inoculated part. Inoculation Sept. 23. Photographed Dec
. Bacteria in relation to plant diseases. Bacteria; Plant diseases. Fig. 120.*. Fig. Agar.—Like Bacterium solanacearum (see pi. 23) agar at 250 C. to 300 C. do not develop rapidly. Fig. 1224 Colonies on plates of +15 standard nutrient They are not visible the first day and often not *Fig. 120.—Cross-sections of base of petiole of inoculated tobacco plant No. 34, showing blackened vascular bundles. These were occupied by the bacteria. Surface of the petiole and midrib sound. The infection entered the leaf from the stem, which was the inoculated part. Inoculation Sept. 23. Photographed Dec. 11. 1905. fFiG. 121.—Portion of midrib of a large tobacco leaf sliced longitudinally to show brown stain due to bacterial occupation of the vascular bundles. The lighter portions of the tissue were green and sound. Photographed Feb. 20, 1906. The infection was due to a stem-inoculation made Sept. 23, 1905, with a pure culture of the North Carolina tobacco organism. The left-hand streak is simply a shadow due to a sulcus in the midrib. The stem should have been lighted from the left side. tFic 122.—Petri-dish poured-plate from the cavity in stem of inoculated tobacco plant No. 31 (plate 38), show- ing the presence of a white organism producing branching colonies. The broader pale patches are thin colonies growing under the agar. This organism has the same type of colony-growth as Bacillus 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 Smith, Erwin F. (Erwin Frink), 1854-1927. Washington, Carnegie Inst.
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