MANUAL OF FRUIT DISEASES 



CHAPTER I 

 , APPLE DISEASES 



APPLES, wherever they grow and of whatever variety, are 

 subject to diseases and injuries of one kind or another. Very 

 few varieties are famous because of their marked resistance to 

 all, or even one, important disease. Growers are fully aware 

 that many varieties, both standard and fancy, are by no means 

 scab-proof. In the warmer states, the Yellow Newtown and Ben 

 Davis are highly susceptible to bitter-rot. Stippen, or bitter- 

 pit, one of the most important of apple diseases, is most com- 

 mon on the Baldwin and others of the best varieties of apples. 

 In the northeastern United States, the Twenty Ounce has come 

 to be known as a canker variety ; it is invariably affected when 

 other neighboring varieties stand free from this type of trouble. 

 Likewise the Tompkins King, Grimes and others suffer unusually 

 from collar-rot. But some varieties are markedly less sensitive 

 to certain troubles than others. The York Imperial and Grimes 

 are relatively resistant to bitter-rot, and many other prominent 

 examples might be cited. 



There are no less than a dozen very important diseases and 

 injuries to which apple-trees are subject, any one of which may 

 bring about considerable annual loss. Many minor diseases, 



B 1 



