FAMILY IV. PSEUDOMONADACEAE 



149 



Indole not produced. 



Hydrogen sulfide not produced. 



Acid but no gas from sucrose and glycerol. 

 No acid from lactose and maltose. 



Starch hydrolyzed. 



Temperature relations : Optimum between 

 27° and 28° C. Minimum, 12° C. Maximum, 

 35.5° C. 



Chemical tolerance: Good growth at pH 

 6.4. No growth at pH 5.4 and pH 8.8 



Habitat: Pathogenic on sunflower, Heli- 

 anthus debilis. 



140. Pseudonionas melophthora Allen 

 and Riker, 1932. (Phytopath., 22, 1932, 557.) 



me.loph'tho.ra. Gr. melum apple; Gr. 

 phthora decaj^ destruction; M.L. adj. 

 rnelophthonis apple-destroying. 



Rods 0.68 by 1.32 microns. Motile with 2 

 polar flagella. Gram-negative; Gram-posi- 

 tive cells appear in old cultures. 



Gelatin : No liquefaction. 



Nutrient agar plus 2 per cent glucose: 

 Colonies appear in 36 hours. After 3 days 

 colonies circular, smooth, glistening, con- 

 ve.x; edges entire; light pink, but not con- 

 stant. 



Broth: Good growth. Pellicle and sedi- 

 ment. 



Milk: Little change, if any. 



Nitrites not produced from nitrates. 



Indole not produced. 



Hydrogen sulfide not produced. 



Acid from arabinose, glucose, galactose, 

 fructose, sucrose and glycerol. No acid from 

 lactose, maltose, dextrin or inulin. 



Starch not hydrolyzed. 



Optimum temperature between 21° and 

 25° C. 



Source: Description based on 7 cultures 

 isolated from rotting apples and from apple 

 maggots. 



Habitat : Pathogenic on apples and found 

 with the apple maggot , Rhagoletis ponionella. 



141. Pseudonionas alboprecipitans 



Rosen, 1922. (Ann. Missouri Bot. Garden, 9, 

 1922, 383.) 



al.bo.pre.ci'pi.tans. L. album the color 

 white; L. v. praecipito to precipitate; M.L. 

 part. adj. alboprecipitans forming a white 

 sediment. 



Description revised in accordance with 



Johnson, Roberts and Cash (Jour. Agr. Res., 

 78, 1949, 723). 



Rods, 0.6 by 1.8 microns, occurring singly 

 or in pairs. Encapsulated. Motile with a 

 polar flagellum. Gram-negative. 



Gelatin: Liquefied 



Nutrient agar colonies: White, circular, 

 raised, smooth, sticky, with margins entire. 

 Whitish discoloration of the medium. 



Broth: Turbid in 24 hours. Heavy sedi- 

 ment in old cultures. 



Uschinsky's solution: Turbid in 24 hours; 

 pellicle formed. 



Cohn's and Fermi's solutions: No growth. 



Milk: Becomes alkaline and slowly clears. 



Nitrites produced from nitrates. 



Indole not produced. 



Hydrogen sulfide production slight. 



Acid but no gas from glucose, galactose, 

 fructose, sucrose, lactose, raflfinose, glycerol 

 and mannitol. No acid from maltose. 



Starch hydrolyzed. 



Temperature relations : Optimum between 

 30° and 35° C. Minimum, 0° C. Maximum, 

 40° C. 



Aerobic. 



Distinctive character: White precipitate 

 in culture media. 



Source: Isolated a number of times from 

 foxtail grass. 



Habitat: Pathogenic on foxtail, Chacto- 

 chloa hdescens, and other grasses. 



142. Pseudonionas andropogonis (Erw. 

 Smith, 1911) Stapp, 1928. (Bacterium andro- 

 pogoni (sic) Erw. Smith, Bacteria in Relation 

 to Plant Diseases, 2, 1911, 63; Elliott and 

 Smith, Jour. Agr. Res., 38, 1929, 4; Pseudo- 

 nionas andropogoni (sic) Stapp, in Sorauer, 

 Handbuch der Pflanzenkrankheiten, 2, 5 

 Aufl., 1928,27.) 



an.dro.po.go'nis. Gr. aner, andris a man; 

 Gr. mas. noun pogon, pogonis beard; M.L. 

 mas. noun Andropogon, -onis man's beard, 

 generic name; M.L. gen. noun andropogonis 

 of Andropogon. 



Description from Elliott and Smith (op. 

 cit., 1929, 4). 



Rods 0.64 by 1.76 microns. Motile with 

 one to several bipolar flagella. Encapsu- 

 lated. Gram-negative. 



Gelatin: Feeble liquefaction or none. 



Beef -extract agar colonies : Slow growing, 

 round, smooth, glistening, viscid, white. 



