140 



FOOD FOR PLANTS 



practice the apples should be left from five to eight 

 inches apart. 



Nitrogen and Phosphates vs. Nothing, in Brown Orchard. 

 The Fertilized Trees, to the Left, Have Averaged 498 

 Bushels per Acre Annually for Six Years. Their Nor- 

 mal Unfertilized Yield for the Same Period Was 208 

 Bushels. Bedford County, Pa. 



Insects and Diseases. 



Probably the most serious enemies of the apple are 

 the codling moth, the plum curculio, the aphis, scab, 

 cedar rust, bitter rot and apple blotch. A number of 

 other insects and diseases, however, cause much 

 injury. 



Among the insects, the San Jose scale, oyster-shell 



