284 



Bulletin 239. 



entrance into the bean plant and the means by which they are carried 

 over from one season to the next, — differs in many respects. In order to 

 combat them successfully it is necessary that the grower have some idea 

 of these differences or at least that he apply the correct name so that he 

 may intelligently consult bulletins or books dealing with these maladies. 



Fig. ioi. — Showing anthracnose spots on stem and 

 leaves of bean just before blossoming time. It is from 

 these, spots that spores are distributed to the pods. 



As the first step, then, determine which disease is causing the trouble in 

 your beans. The following key will, I think, enable you to determine this 

 with considerable certainty : 



How to detcrmiiic i^'hich disease is in your beans. — With some of the 

 diseased beans before you, carefully read the following and compare the 

 specimens with the pictures. 



I. Rusty brown or black spots on stems, pods or leaves. Frequently 

 on all (See Figs. 100 and loi). These spots occur on the seed leaves of 



