METHODS OF CONTROL AND PREVENTION 269 



On cutover areas slash and stumps furnish the principal 

 breeding places. In areas of uncut timber the scattered 

 trees or groups of trees already infested with insects are the 

 ones to be treated. 



The details of treatment for the slash and standing trees 

 must be worked out scientifically to meet the circumstances 

 of each individual case. In general aU small material can be 

 completely burned, while large portions of the trunk and 

 limbs should have the bark peeled and burned in such a way 

 as to thoroughly char the peeled logs. They then become 

 unfavorable breeding places. Stumps may have to be peeled 

 down to the ground and charred by having the peeled bark 

 burned in proximity to the stump. Standing trees may be 

 felled and treated as just described or left standing and a 

 portion of the trunk of the standing tree peeled of bark. 

 With some species, such as the southern pine beetle," it may 

 be unnecessary to peel the stump or the entire trunk. 

 I Other effective methods of disposing of insect infested ma- 

 terial are to place the logs in water, utilize the trees for cord- 

 wood or to cut the logs into lumber and burn the slabs and 

 bark before the insects emerge. 



The peeling and burning is most effective if accomplished 

 after the insects have entered but before they have emerged 

 from the slash, stiunps, or standing trees. Sometimes so 

 called "trap" trees may be felled for the purpose of attracting 

 insects. The insects prefer this freshly cut material and will 

 enter such trees and be destroyed in the subsequent peeling 

 and burning operations. 



When branches or terminal shoots of young trees are at- 

 tacked by boring insects (as in the case of the white pine 

 weeAol, Pissodes strobi), the injured portions may be cut off 

 and burned; and in the case of seedlings the entire plants 

 may be pulled up and destroyed. 



