. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. BLACK ROT OF CRUCIFEROUS PLANTS. 3-2.^ vSo far as known it is strictly aerobic, /. c, it does not produce gas or grow in the closed end of fermentation-tubes in peptone-water or peptonized beef-bouillon with any of the follow- ing carbon compounds: grape-sugar, fruit-sugar, cane-sugar, galactose, milk-sugar, maltose, dextrin, mannit, glycerin; neither will it grow in the closed end in potato-broth, cabbage- broth, or cauhflower-broth; nor with nitrates (Harding). If anyacids are produced, the pres-. ence of air is required
. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. BLACK ROT OF CRUCIFEROUS PLANTS. 3-2.^ vSo far as known it is strictly aerobic, /. c, it does not produce gas or grow in the closed end of fermentation-tubes in peptone-water or peptonized beef-bouillon with any of the follow- ing carbon compounds: grape-sugar, fruit-sugar, cane-sugar, galactose, milk-sugar, maltose, dextrin, mannit, glycerin; neither will it grow in the closed end in potato-broth, cabbage- broth, or cauhflower-broth; nor with nitrates (Harding). If anyacids are produced, the pres-. ence of air is required and they are readily obscured by the production of alkali (ammonia). It is not conspicuous as a reducer of litmus. Its reducing powers are variable. Occasionally some hydrogen sulphide is formed. In cabbage-broth containing litmus the organism *FiG. 12S.—Petri-dish cultures of Bacterium campestre. showing character of colonic»s and effect of crowding on size. Cultures .S days old at room temperature. Figs, i and 2 contain crystals due to growth of organism in +15 agar Small dots are buried colonics; medium-sized faint colonies, as in the center of 2, are thin expansions of the same organism between agar and bottom of dish. These poured-plates were made directly from blackened vascular ring of a young shoot of collard shown in fig. 105 (at the point marked .t). Natural 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, D. C. , Carnegie Institution of Washington
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