JONES SOFT ROT OF CARROT, ETC. I TYPE 



225 



begins at the crown or at the root-tip. The disease continues 

 in the stored carrots which often decay very rapidly and in large 

 numbers. The core of the carrot rots more rapidly than the outer 

 part of the root, and flabby roots are much less susceptible than 

 turgid ones (Fig. 167). The attacked roots of half-long orange 

 carrots are stained a dark brown, this color commencing within 

 24 hours; those of the long-orange carrot are not stained or only 

 slowly and slightly stained. Inoculated parsnip roots are 



FiG.^165. Same as inoculated half of Fig. 164, but after it had l>een dropped. 

 Tissue entirely soft rotted except a thin external layer. % nat. size. 



changed to a clay color deepening to cinnamon brown. The 

 spots on green tomato fruits are turned dark. Jones observed 

 no stain in other inoculated rotting plants. Decay of the cruci- 

 ferous roots was accompanied by an offensive odor. Decaying 

 onions also emitted a bad odor. 



The disease has been seen in the United States occurring 

 naturally or has been obtained artificially by pure-culture in- 

 oculations on the following plants: carrot, parsnip, celery, 



15 



