PLATE s 
A.—Rootrot spot, approximately 7 meters in diameter, in an alfalfa field, Sep- 
temberi8^ 1921. t at the beginning of disease activity, June 18,1922, now approxi¬ 
mately 9 meters m diameter. The stakes designate the outer ran of the circular 
band of dying plants. . , ,, 
C. —The same spot July 6, 1922, after the hay had been cut. . T 
D. —The same spot August 26, 1922, approximately 13 meters m diameter, in the 
interior of the spot appears the growth of grass, weeds, and reestablished alfalfa plants. 
Light colored fruiting bodies of the fungus can be seen at the right, near the periphery. 
