THIS paper presents one part of a study of a group 
of alfalfa and clover diseases., which was begun 
in the Department of Plant Pathology at the Univer- 
sity of Wisconsin in 1914. In 1916 the writer became 
a collaborator in the Office of Cotton. Truck, and For- 
age Crop Disease Investigations of the Bureau of 
Plant Industry, and through cooperation between the 
Bureau and the Wisconsin Agricultural Experiment 
Station the scope of the work was extended. The 
work has been done under the immediate direction 
of Dr. L. R. Jones, to whom grateful acknowledg- 
ments are expressed. 
