Rusts 



kind of spore altogether, of a deep chestnut colour 

 and of different form (teleutospores), incapable of 

 immediate germination. The teleutospores remain 

 on the dead straw through the winter and then 

 germinate, forming there a few spores only which 

 cannot attack wheat but grow only on the Barberry, 

 recommencing the life-cycle. 



These and other phenomena make the study of 

 diseases of plants produced by fungi very interestiug, 

 but at the same time very difficult, and compUcate 

 methods of control. For instance, the destruction 

 of all the black currants within a radius of two miles 

 of a plantation of Pinus Strobus would doubtless 

 protect that valuable tree from the bHster-rust that 

 has proved so fatal to it where it has occurred, but 

 so many interests would be involved that such 

 measures are almost impracticable. 



55 



