132 FUNGI AND FUNGICIDES 



value, because of their accounts of remedial treatment, 

 will be found in the report of the New Jersey Experi- 

 ment Station for 1891, and in Bulletin No. 48 of the 

 Ne\v York Experiment Station. The latter account 

 contains a list of sixteen articles, in which the disease is 

 discussed. 



The Bean Rust 



Uromyces phaseoli 



This is a decidedly different disease from the an- 

 thracnose of the bean. It commonly appears on both 

 surfaces of the leaves in the form of small, round, brown, 

 scattered spots, which at first are about the size of pin 

 heads. These soon give off a brown powder, which is 

 composed of the spores, or reproductive bodies of the 

 fungus. In the course of the season the brownness of 

 the spots changes to black. Often both brown and 

 black spots may be found on the same plant at the same 

 time. The blackness simply represents a later stage of 

 development of the fungus. This disease is seldom 

 destructive, and little has been done in the way of reme- 

 dial treatment. Presumably spraying the plants with 

 Bordeaux mixture will prove a preventive. 



The Bean Blight 



In some parts of America still another disease has 

 proved destructive to beans. It appears to be due to 

 bacteria. Mr. S. A. Beach says that "in its early stages 

 this blight forms small pimples, which have a watery 

 appearance. These may occur on the pods, blossoms (?) 

 foliage or stems. They may or may not have a dull 

 red border, but do not have either the black color or 

 the sunken spots which characterize anthracnose. Mi- 

 croscopic examination in the early stages of the blight 

 failed to reveal the presence of any mycelium, but bac- 



