160 



PSEUDOMONADALES 



ca'ja.ni. M.L. mas.n. Cajanus generic 

 name of host; M.L. gen. noun cajani of 

 Cajanus. 



Rods 0.9 to 1.4 by 1.3 to 2.2 microns. 

 Encapsulated. Motile with a single polar 

 flagellum. Gram-negative. 



Gelatin: Liquefied. 



Potato-glucose agar colonies: 1.5 cm in 

 diameter after 7 days, smooth, glistening, 

 entire, pulvinate, naphthalene-yellow. 



Milk: Litmus reduced. Casein digested. 



Loeffler's blood serum: Liquefied in 10 

 days. 



Hydrogen sulfide produced. 



Nitrites not produced from nitrates. 



Acid but no gas from glucose, lactose and 

 sucrose. Salicin not attacked. Citrates 

 utilized. 



Starch hydrolyzed. 



Methyl red negative; acetylmethylcar- 

 binol not produced. 



Synthetic asparagine medium: No growth. 



Salt tolerance: Up to 3 per cent. 



Optimum temperature, 30° C. 



Aerobic. 



Relationship to other species: Similar to 

 Xanthomonas phaseoli, which also infects 

 various legumes. 



Source: Isolated from the pigeon pea, 

 Cajanus cajan, in India. 



Habitat: Pathogenic on Cajanus cajan. 



12. Xanthomonas citri (Hasse, 1915) 

 Dowson, 1939. {Pseudomonas citri Hasse, 

 Jour. Agr. Res., 4, 1915, 97; Dowson, Zent. f. 

 Bakt., II Abt., 100, 1939, 190.) 



cit'ri. L. citrus the citrus; M.L. fem.n. 

 Citrus generic name; M.L. gen. noun citri of 

 Citrus. 



Rods, 0.5 to 0.75 by 1.5 to 2.0 microns, 

 occurring in chains. Motile with a single 

 polar flagellum. Gram-negative. 



Gelatin: Liquefied. 



Beef agar colonies: Appear in 36 to 48 

 hours; circular, smooth, raised, dull yellow. 



Broth: Turbid in 24 hours. A yellow ring 

 forms. 



Milk: Casein is precipitated. 



Nitrites not produced from nitrates. 



Hydrogen sulfide produced (Reid, New 

 Zealand Jour. Sci. and Tech., 22, 1938, 60). 



Indole not produced. 



No gas from glucose, lactose or mannitol. 



Starch hydrolyzed (Reid, loc. cit.). 



Aerobic. 



Temperature relations: Optimum, be- 

 tween 25° and 34° C. Minimum, 10° C. 

 Maximum, 38° C. (Okabe, Jour. Soc. Trop. 

 Agr., J^, 1932,476). 



Source: Isolated from canker on orange. 



Habitat: Produces a canker on man.y 

 species of Citrus and related plants. 



13. Xanthomonas clerodendri Patel 

 et al., 1952. (Xanthomonas clerodendroni (sic) 

 Patel, Kulkarni and Dhande, Curr. Sci., 21, 

 1952, 74.) 



cle.ro. den'dri. M.L. neut.n. Clerodendron 

 generic name of the plant host; M.L. gen. 

 noun clerodendri of Clerodendron. 



Rods, 0.5 by 1.1 microns, occurring singly 

 or in chains. Encapsulated. Gram-negative. 



Gelatin: Liquefied. 



Potato-glucose agar colonies: Circular, 

 1.8 cm in diameter in 7 days, margins entire. 

 Pale lemon-yellow. 



Litmus milk: Casein digested. Litmus re- 

 duced and milk peptonized. 



Hydrogen sulfide produced. 



Nitrites not produced from nitrates. 



Acid but no gas from glucose, sucrose and 

 lactose. No growth in salicin. 



Starch h3^drolyzed. 



Optimum temperature, about 31° C. 

 Thermal death point, 51° C. 



Source: From a leaf spot on Clerodendron 

 phlornoides . 



Habitat: Pathogenic on Clerodendron 

 phlomoides. 



14. Xanthomonas corylina (Miller et 

 al., 1940) Starr and Burkholder, 1942. (Mil- 

 ler, Bollen, Simmons, Gross and Barss, 

 Phytopath., 30, 1940, 731; Starr and Burk- 

 holder, Phytopath., 32, 1942, 598.) 



co.ry.li'na. Gr. conjlus the hazel; IVI.L. 

 adj. corylinus pertaining to hazel. 



Rods 0.5 to 0.7 by 1.1 to 3.8 microns. 



Motile with a polar flagellum. Encapsu- 

 lated. Gram-negative. 



Gelatin: Liquefied. 



Nutrient glucose-agar streaks: Growth 

 abundant, filiform, convex, glistening, 

 smooth, opaque, pale lemon-j^ellow, viscid. 



Broth: Turbid. Ring formed in 2 to 5 

 days. 



Milk: Enzymatic curd that is slowly di- 



