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 oh 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 



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 maj ority 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 larvse, 

 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. 



