Diseases of Plants 303 
R. F. Poole, N. J. Expt. Sta. 
Fic. 171. Bean seeds showing anthracnose spots. If these seeds are planted, 
the disease will be transmitted to the plants of the next crop. 
swellings when they are ‘ 
destroy them by burning. 
‘green’ and immature, and 
BEAN ANTHRACNOSE 
The most common and perhaps the most destructive of 
the diseases that attack varieties of the common or kid- 
ney bean is the disease known as bean anthracnose. It is 
nearly always present on some varieties. The fungus at- 
tacks pods, stems, leaves, and even roots, causing dis- 
colored blotches to appear. On the pods these first appear 
as small, dark-colored spots which soon increase in size, be- 
coming quite conspicuous. They are usually somewhat 
circular and black or rusty, but may be pinkish at certain 
stages. These “ cankers,’’ as they are called, become 
sunken and dry and hard. It is im these areas that the 
fungus is living. Spores are produced on the surface of 
the canker; and as these are sticky when wet, they are 
