SCHIZOMYCETES. BACTERIA 



109 



are affected they may be killed. Any affected plants are prey t<> 

 saprophytic organisms, and an offensive soft rot is then likely to 

 result. \Yhether in the leaves or in the stem, the course of the 



Fi<;. 24. A CAIMJAC.K LKAK WITH I'.i \< K KT m.vi i. <>IMV, FK<>M \Vvn-.u 

 1'oKK I\i i Photograph by F. C. Su-wart and II. A. 



disease may usually be traced by a darkening of the fibrovascular 

 bundles. Fig. 23 shows a healthy and a diseased plant, the latter 

 as a result of artificial infection. Root infection may also occur. 



This disease has been found upon apparently all of the common 

 varieties of cabbage, in regions when- the- organism has gained a 

 strong foothold. Turnips, cauliflower, kale, rape, and other sp 



