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, 
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