[newton] 



WHEAT STEM RUST 



185 



by the grain growing industry. In fact, this area will probably 

 continue, for a long time, to be the main wheat centre. In portions 

 of southern Alberta and Saskatchewan, on account of the rather arid 

 conditions which prevail, wheat will probably never be the crop of 

 first importance. With regard to the more northern and western 

 districts it has been pointed out already that rust infection seldom 



Fig. 1. A. Distribution of Form XVII (virulent) in area explored. 

 B. Area in which have been found the 6 dominant forms. 



