205 



The distribution of this disease in Illinois is shown on Map 37. 

 No means of control are available, but much of the injury may be 

 avoided by seeing that the cutting of the crop is not delayed. 



Leaf Spot 

 Caused by Polythrincium trifolii Kuntze 



Leaf spot has been found on red clover in McDonough, Carroll, 

 Winnebago, Adams, Schuyler, Union, Saline, Coles, Pulaski, and Menard 

 counties. 



Rust 

 Caused by Uromyces fallens (Desm.) Kern. 



Rust has been found on red clover in Kane, Putnam, Kendall, Union, 

 DeKalb, C)gle, X'ermilion, Edgar, Lake, Wayne, Bureau, Tazewell, and 

 Menard counties. 



Timothy 



Stem Rust 

 Caused by Puccinia graminis Pers. 



The commonest and most serious disease of timothy in Illinois is 

 stem rust, but no early records of its occurrence are available. Its known 

 distribution, shown on Map 38, includes 5.5 counties and indicates a wide- 

 spread and common occurrence in northwestern and southern Illinois. 



Le.\f Smut 

 Caused by Ustilago striaeformis (Westd.) Niessl. 



-Smut has been found on timotli}- in Illinois, in three counties: Madi- 

 son. Sangamon, and Moultrie. The infection in Moultrie county re- 

 sulted in a 20 per cent crop-loss in one field. Other infections were not 

 severe. 



Redtop 



Stem Rust 

 Caused by Puccinia (/raniiiiis Pers. 



The only important disease of redtop commonly found in Illinois is 

 stem rust. 



Its presence on this cro]) was recorded by A. B. Seymour in ISSl. 

 It is now known to occur in 2() counties as shown on Map 3!i. The 

 distribution in these counties suggests that the disease is of state-wide 

 occurrence, though possibly more abundant southward. 



