200 



DISEASJiS OF ECONOMIC PLANTS 



Since the spores are spread only when they are wet, 

 hancUing or disturbing the vines in any way while the 



Fie. 89. — Bean rust upon leaf and pods ; note the numerous sori upon both surfaces. 

 After Beach. 



dew or rain is still upon them should be avoided. Seeds 

 already bearing the fungus, i.e., spotted seeds, should 

 never be planted, since they not only raise sick plants, 



