103 



For that little word "rust" is used to include almost all of 

 th€ leaf diseases, of which Prof. G. F. Atkinson has de- 

 scribed several in the earlier bulletins of this station. The 

 one which, in his experiments, was influenced by kainit, 

 was what i.s generally known as black rust, but which he 

 designated as ''mosaic disease," or "yellow leaf blight." 



Leaf diseases were widely prevalent and destructive in 

 1897, and until late summer dry weather was general. Re- 

 membering these abnormal conditions, we should not ex- 

 pect kainit to exert so favorable an effect in normal seasons 

 and in years when leaf diseases are less injurious. 



