436 



BACTERIAL DISEASES OF PLANTS 



Fig. 334.— Crown-gall teratumu en h'lnrnts cotnmuni!^ (castor oil plant). 

 Inoculated with hop strain of Bacterium tumefaciens in two places hy needle- 

 pricks March 25, 1916. Photographed April 29, 1916. y^ nat. size. Leaves 

 reflexed and dying. Secondary tumors on petiole at A'. The tumor-bearing plant 

 was of the same age and size as the check wlicii it wa.s inoculated. 



