B, +4, Bureau of Plant Industry. U. S. Dept. of Agriculture. 



Plate IV. 



Fig. 1.— A Ben Davis Apple, Showing 

 Blotches Produced by Inocula- 

 tion. 



Fig. 2.— A Gano Apple, Showing 

 Blotches Resulting from 

 Natural Infection. 



Fig. 3— A Power Spraying Outfit in Operation. 



