THE CLOVER RUST. 



[Uromyces Trifolii (Alb. and Scliw. ) Whit.] 



The Clover Rust should be distinguished from two other dis- 

 eases of the Red and White Clovers of minor importance, one 



Phyllachora Trifolii, the oth- 

 er Phacidium Trifolii. Both 

 of the latter produce black, 

 P] smoothish discolorations, 

 chiefly of the leaves ; while 

 the true ''Clover Rust" in- 

 fests the leaves, the leaf-stalk 

 or petioles, and the stems. 

 In appearance the spots of 

 the Rust proper (Fig i.) are 

 oblong, well defined, brown 

 in color, and somewhat pow- 

 dery on the surface. 



The disease has not been 

 long known in America, but 

 has prevailed to such an ex- 

 tent during the several wet, 

 cool seasons preceding 1890, 

 in many sections of the north - 



Fig. 1 — A Red Clover leaf affected with 

 the Clover Rust (II and III Stages.) 



ern states, that it must be regarded as a disease likely to affect se- 

 riously, under conditions favorable to its development, an agricul- 

 tural crop. 



The natural relationships of Uromyces Trifolii, the fungus caus- 

 ing this disease, may be of interest to the farmer and gardener, as 

 they are brought into close contact with a considerable number of 

 fungus parasites differing widely in their character, habits, and 

 natural affinities. 



The above is one of the true " Rusts," all of which are included 

 in the Natural Order Uredineae. To this also belongs the "Holly- 

 hock Rust ' ' or Blight. Many gardeners during the two years past 

 have become alarmed concerning the spread of the latter on the 

 cultivated Hollyhocks, where it appears as brown or gray wart-like 



