152 
THE SCOLYTID BEETLES. 
or park are involved, or even where many are attacked in a forest 
under a complete system of forest management, serious injury may 
be prevented by cutting the beetles out of the bark with a chisel or 
knife as soon as the discharge of resin on the bark indicates their 
presence; or they can often be killed quickly and effectually by 
means of a stout wire inserted into the entrance burrow, if done before 
the parent beetles have extended their galleries into the inner bark 
beyond 2 or 3 inches. 
It appears that in places where continued timber-cutting opera- 
tions are carried on there are sufficient and most attractive breeding- 
places for this beetle; therefore in such sections little or no damage 
to the living and otherwise uninjured trees will result. If the cutting 
should be discontinued for one or more years throughout a large 
L --r->— -TV 
Fig. 96. — The black turpentine beetle: Distribution map. (Author's illustration.) 
area, and if it seems desirable, the infested bark may be removed 
from the majority of the stumps of trees felled during the fall, winter, 
and spring, or the brush piled around the stumps and burned, the 
work to be done during the fall and winter following the cutting. 
In case the removal of the bark from the stumps is required in 
timber-cutting contracts, it should be specified that the bark must 
not be removed until after it becomes infested with broods of larva 1 , 
or, in other words, the stumps of trees felled in the fall, winter, and 
spring should not be barked to destroy the broods of this beetle 
before the following June or July, but the barking must be com- 
pleted before the following March. Trees felled during the spring 
and summer to serve as traps should not have the bark removed for 
at least two months after such operation. 
