PEACH DISEASES 



299 



FROST-INJURY 



Caused by the action of low temperatures 



FIG. 79. Peach- 

 trunk injured by 

 frost. 



In New York, New England and elsewhere 

 peaches suffer from the cold. Trees are even 

 killed, a phenomenon 

 which makes the 

 trouble an important 

 one. Trees which are 

 winter-injured show 

 blackened bark in the 

 spring ; this injured 

 bark becomes more or 

 less separated from 

 the trunk and the 

 brown wood is evident 

 (Figs. 79 and 80). 

 Such injuries are com- 

 monly found at the 

 crown, in which case 

 the disease is called 

 crown-rot or collar-rot 

 (Fig. 79); on the 

 trunk and larger 

 limbs, where it is 

 called frost-canker or 

 sun-scald (Fig. 80); 

 and on the twigs, where 

 it is often referred to 

 as die-back (see also 

 page 300). Toward 

 midsummer frosted 



FIG. 80. Frost-canker on 

 peach-limb. 



which at first is yellow, 



