456 



BACTERIAL DISEASES OF PLANTS 





FIG. 347. Crown-gall teratoma on sugar-beet. Plant inoculated by Nellie 

 A. Brown, January 26, 1918, using a sub-culture of Bacterium tumefaciens plated 

 from a rose gall. The main axis of the beet is a long way off in the direction of the 

 arrow. All here visible is tumor. Growing out of the rough tumor tissue at 

 X is a small, bright-green, branched, fleshy (tumefied) shoot. Photographed 

 April 25, 1918. X 6. 



