244 



15ACTERIAL DISEASES OF PLANTS 



' : 



FIG. 185. A celery plant inoculated by needle-pricks with Wormald's Bacillus 

 apiovorus in the central part. Inoculated May 11. 1915. Photographed May 

 17. One inoculated leaf-stalk broken over, another diseased and discolored 

 but still erect. 



