PLATE 6 
A. —Seedling rhubarb in pots, the one inoculated and the other not. 
B. —Rhubarb plant in the experimental field inoculated July 20, 1920, by applying 
the fungus from pure cultures at the wound left by pulling leaf stalks. Photograph 
taken six days after the inoculation. The plant was killed. 
20616—23 - 3 
