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 
or barked. 
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, pupae, 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.) 
