THE FUNGI WHICH CAUSE PLANT DISEASE 43 



present knowledge seems certainly to be the most wide spread, 

 common and destructive of the soft rot bacteria. Some, perhaps 

 much, of the rot of crucifers generally thought to be due to Pseudo- 

 monas campestris is probably caused by B. carotovorus. See 

 Harding & Morse.'* 



B. caulivorus, Pril. & Del. has been reported as the cause of 

 spots on grapes under glass, also as a parasite on a large number 

 of other plants among them Pelargonium, potato, begonia, clem- 

 atis. It is later stated that this is probably really a variety of 

 Ps. putrifaciens liquefaciens. 



B. cepivorus Del. (possibly a Bacterium) is recorded on onion 

 bulbs.«i 



B. coli (Esch.) Mig. or an organism indistinguishable from it is 

 held by Johnston ^*' capable of causing rot of soft tissues of the 

 cocoanut plant and is perhaps responsible for cocoanut bud 

 rot. 



B. cubonianus Mace, was originally described as the cause of 

 mulberry disease (cf. Ps. mori). This organism, or at least one 

 that was regarded as indistinguishable from it, has been men- 

 tioned as the cause of a disease of hemp.^"* 



B. C3rpripedii Hori is a medium sized slender, non-sporulating 

 form with four flagella."* 



B. delphini E. F. Sm. This is a motile, gray-white, nitrate- 

 reducing, non-liquefying organism. On agar young colonies small, 

 circular, wrinkled. Grows well at 30°, not at all at 37.5°. T. D. 

 P. 4&-49.1°. 



The cause of stomatal infection of larkspur resulting in sunken 

 black spots on leaves and stems.'"® 



B. elegans Hegyi is reported on lupine.^" 



B. dahlise Hori & Bakis is on dahlia."* 



B. gossypini Stedman was reported by Stedman i"* as the 

 cause of cotton-boll soft rot in Alabama; much doubt, however, 

 remains as to its actual identity and causal relation. It was de- 

 scribed as a short, straight, spore-forming motile bacillus; 1 .5 x 

 .75 n; aerobic; non-liquefying (?). 



B. gummis Comes, has by some been held responsible for gum- 

 mosis or mcd new of the grape vine '"^ though others discredit this 

 idea. 



