138 



ORDER I. PSEUDOMONADALES 



Habitat: Causes a root rot of ginseng, 

 Panax quinquefoliitm. 



107. Pseudomonas ribicola Bohn and 



Maloit, 1946. (Jour. Agr. Res., 73, 1946, 288.) 



ri.bi'co.la. M.L. noun Ribes generic name 

 of currant; L. colo to dwell; M.L. fera.n. 

 ribicola the currant dweller. 



Rods, 0.4 to 0.9 by 0.9 to 1.7 microns, 

 occurring singly, in pairs and in hypha-like 

 chains. Motile by 1 or more polar flagella. 

 Gram-negative. 



Gelatin: Very slow liquefaction. 



Beef -extract agar colonies: Punctiform, 

 smooth, translucent, white; edges entire. 



Beef -extract agar slant: Growth scant, 

 filiform, glistening, translucent, white, 

 slightly viscid. 



Broth: Slightly turbid; no ring or pellicle. 



Potato dextrose slants: Growth moder- 

 ate, filiform, glistening, butyrous to viscid. 

 Medium slightly yellow. Dirty pink pig- 

 ment in old cultures. 



Milk: Slightly darkened, becoming alka- 

 line. 



Nitrites produced from nitrates. 



Growth good in Uschinsky's and Fermi's 

 solutions; yellow-green pigment produced. 

 No growth in Cohn's and Ashby's mannitol 

 solutions. 



Indole not produced. 



Hydrogen sulfide not produced. 



Acid from glucose, galactose, fructose, 

 xylose and mannitol. 



Starch not hydrolyzed. 



Asparagine utilized as a carbon-nitrogen 

 source. Tj^rosine oxidized. 



Not lipolytic. 



Temperature relations: Optimum, be- 

 tween 20° and 25° C. Minimum, less than 

 3.5° C. Maximum, between 30° and 32° C. 



Source: Six single-cell isolates from leaf 

 spot of golden currant in Wyoming. 



Habitat: Pathogenic on Ribes aureum. 



108. Pseudomonas xanthochlora (Schuster, 

 1912) Stapp, 1928. {Bacterium xanthochlorxim 

 Schuster, Arbeit, a. d. Kaiserl. Biolog. 

 Anstalt. f. Land. u. Forstw., 8, 1912, 452; 

 Stapp, in Sorauer, Handbuch der Pflanzen- 

 krankheiten, 2, 5 Aufl., 1928, 213.) 



xan.tho.chlo'ra. Gr. xanthus yellow; Gr. 



chlorus green; M.L. adj. xanthochlorvs yel- 

 lowish green. 



Description from Erw. Smith (Bacteria 

 in Rel. to Plant Dis., 3, 1914, 272). 



Rods 0.75 to 1.5 by 3.0 microns. Motile 

 with 1 to 3 polar flagella. Gram-negative. 



Green fluorescent pigment produced in 

 culture. 



Gelatin: Slow liquefaction. 



Agar colonies: Circular, slightly raised, 

 yellow-white. 



Broth: Strong clouding in 24 hours. A 

 white pellicle. 



Milk: Slow coagulation and clearing. 



Nitrites produced from nitrates. 



Indole produced after 10 days. 



Hydrogen sulfide produced slowly. 



Acid but no gas from glucose and galac- 

 tose. 



Temperature relations: Optimum, 27° C. 

 Minimum, 2° C. Maximum, 44° C. 



Source: Isolated from rotting potato 

 tubers in Germany. 



Habitat : Pathogenic on potato tubers and 

 a number of unrelated plants. 



109. Pseudomonas aleuritidis (McCul- 

 loch and Demaree, 1932) Stapp, 1935. (Bac- 

 terium aleuritidis McCulloch and Demaree, 

 Jour. Agr. Res., 43, 1932, 339; Stapp, Bot. 

 Rev., 1, 1935,408.) 



a.leu.ri'ti.dis. Gr. aleurites of wheaten 

 flour; M.L. fem.noun Aleurites generic 

 name; M.L. gen. noun aleuritidis of Aleu- 

 rites. 



Rods 0.6 to 0.7 by 1.1 to 3.0 microns. 

 Motile with 1 to 5 polar, rarely bipolar, 

 flagella. Encapsulated. Gram-negative. 



Green fluorescent pigment produced in 

 certain media. 



Gelatin: Not liquefied. 



Beef agar slants: Growth is thin, white 

 and viscid. 



Broth: A heavy white surface growth in 

 24 hours. Sediment. 



Milk: Becomes alkaline, but no separa- 

 tion. 



Nitrites produced from nitrates. 



Indole test feebly positive. 



Hydrogen sulfide test feebly positive. 



Acid but no gas from glucose, galactose 

 and glycerol. Slow acid production from 

 sucrose, maltose and lactose. 



