PEACH DISUASES 
Frost-INJURY 
299 
Caused by the action of low temperatures 
In New York, New England and elsewhere 
peaches suffer from the cold. Trees are even 
Fic. 79.— Peach- 
trunk injured by 
frost. 
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 
trees exhibit foliage 
which at first is yellow, 
Fic. 80. — Frost-canker on 
peach-limb. 
