534 



BACTERIAL DISEASES OF PLANTS 



FIG. 402. Shoot of White McCormick potato from a pared sterile block 

 cut from a potato tuber and sealed into a test tube on wet cotton, February 18, 

 1919, and held in very dull light at 23 to 25C. Base and middle covered with 

 intumescences, ruptured and unruptured. Shoots and roots dying of asphyxia- 

 tion. Photographed March 22. X 5. 



