THE GENUS DENDROCTONUS. 



67 



forest management, as also where there are regulations governing the 

 time of year when the timber shall be cut, in both regular and irregu- 

 lar operations, as well as the time 

 when lightning-struck and other- 

 wise injured trees shall be removed I HE? '"' i+ Mi J 

 or barked. •'/■_•' fa ffw /mM 



METHODS OF CONTROL. 



In order effectually to destroy 

 the insect, it is only necessary to 

 remove the infested bark from the 

 trunks and burn it. It is entirely 

 unnecessary to burn or otherwise 

 destroy any part of the wood from 

 which the bark has been removed, 

 because the destructive beetle does 

 not enter the wood and rarely 

 breeds in the bark of the tops and 

 branches. With this particular 

 species, however, it is necessary 

 to burn the bark after or before 

 it is removed, because the ma- 

 tured larvae, pupse, and adults 

 pass the winter in the outer dry 

 bark, where they would otherwise 

 survive and emerge in the spring, 

 to attack other trees. 



In localities or areas of greater 

 or less extent where it has been 

 positively determined that the 

 timber is attacked and killed by 

 this beetle, the principal groups 

 of trees which are actually in- 

 fested with the broods should 

 be located in the period from 

 November to March, and the 

 standing trees, including all of 

 the larger ones, so infested should 

 have the bark removed from 

 the main trunks or be felled 

 and barked, or the entire trunk 

 scorched, burned, placed in water, 

 or converted into lumber and the 

 slabs burned, as in each case is more practicable or advisable. In 

 the northern section this work should be begun not earlier than the 1st 



Fig. 29.— The southern pine beetle: Section 

 of pine trunk, bark removed, showing 

 the galleries marked on surface of wood 

 and the dark patches caused by the blue- 

 ing fungus. (Original.) 



