204 



The disease is serious and destructive where it appears, but no specific 

 control-measures can be recommended. 



Sweet Clover 



Leaf Spot 



Caused by Cercospora davisii E. & E. 



Leaf spot was found in Pike county near Barry in 1910 by H. W. 

 Anderson. 



Anthracnose 



Caused by Glocosporium caidivoniiii Kirch. 



Anthracnose seems to be the one serious disease of sweet clover. 

 It causes stem cankers and some reduction in yield. 



The distribution of anthracnose as known at the present time ap- 

 pears limited, as shown on Map 35, to northern Illinois, where it is 

 known to occur in 15 counties. 



Red Clover 



This crop is subject to the attack of five diseases. 



Anthracnose 

 Caused by CoUctotrichnm trifolii Bain 



Anthracnose has been found on red clover in the counties indicated 

 on Map 36. Its distribution appears limited to the extreme northern 

 part of the state. The fields in which it was found did not appear to be 

 greatly injured, and the degree of infection was usually slight. 



Causfed by Glocosporium cauUvorum Kirch. 



This disease has been found on red clover in Union, Ogle, DeKalb. 

 Champaign, and Sangamon counties. 



Powdery Mildew 

 Caused by Erysiphc polygoni DC. 



Powdery mildew appeared throughout the eastern jwrt of the United 

 States as a serious disease of red clover in the fall of li'Sl. This out- 

 break spread rajjidly westward, and in the spring of lf)22 became very 

 noticeable in Illinois. 



Plants attacked by powdery mildew appear to have had their leaves 

 dusted with flour. If diseased clover is allowed to stand after time for 

 cutting, the (juality of the hay is imjiaired, and the quality and quantity 

 of yield from crops grown for seed is also impaired. 



