Diseases of Alfalfa and Clover T23 



ANTHRACNOSE 



When affected by antliracuose, Colletotrichum trifolii Bain, 

 black spots are produced on the stems and petioles, and, rarely, 

 on the leaves of clover and alfalfa. It may be very severe in 

 some cases. Alsike clover seems to be almost immnne. 



The only control known is by selection of seeds from resistant 

 plants. In order to be sure that such plants are secured, they 

 should be selected from a field in which the disease is severe. In 

 subsequent planting of this seed, precautions must be taken to 

 have an abundance of old, diseased plants scattered around to 

 test the clover thoroughly and kill out all plants that are not 

 resistant. Continued selection is necessary to eliminate all but 

 thoroughly resistant plants. 



