12 SOME INSECTS INJURIOUS TO FORESTS. 



thej^ transform to the adult beetles and emerge. If preferable, the 

 same end may be accomplished by burning the tops and worthless 

 parts and by submerging the valuable parts in ponds or streams until 

 the borers are killed. 



DAMAGE TO CUT WOOD AND DANGER OF INTRODUCTION INTO NEW 



LOCALITIES. 



As we have shown that after the borers have once entered the wood 

 they may complete their development in the cut and dry branches, 

 they will evidently do so in posts or other material manufactured from 

 trees cut between the first of May and the middle of September; 

 therefore, it is plain that locust should not be cut during this period for 

 any purpose except to destroy the borers, or, if it should be necessary 

 to cut it, the tops should be burned and the logs submerged in ponds 

 or streams for a few days before they are shipped or manufactured. 

 This is very important both to prevent damage to the manufactured 

 material and the introduction of the insect into the far West and other 

 sections of the country which are at present free from it. 



PROPER LOCATIONS FOE EXTENSIVE PLANTATIONS. 



The fact that there are many sections and localities of greater or 

 less extent within the natural home of the locust and its insect enemies 

 where, from some unknown cause, the tree grows to large size and old 

 age without perceptible injury from borers and other insects, suggests 

 the importance of selecting such localities for anj' proposed extensive 

 operations in the line of artificial plantation, or utilization of natural 

 growth. It will be found, however, that no area of considerable 

 extent, even in such localities, is entirely free from this and other 

 destructive insect enemies, and that certain precautions and well- 

 planned methods of management with reference to their control will 

 be necessary. 



PRELIMINARY REQUISITES. 



In the first place it is necessary, in order to provide against future 

 losses from the borei', that a thorough survey be made in Mav and 

 June, not onlj"^ of the area to be utilized but of the entire neighbor- 

 hood for a radius of a mile or more from its borders, for the purpose 

 of locating and destroying scattering trees and groves which are more 

 or less seriously infested or damaged by the borer. It would seem 

 that the control of such large areas, by purchase or under a plan of 

 cooperation between the owners of the land or trees, is one of the most 

 important requisites for success in preventing future losses from the 

 ravages of this and other insects in small as well as large plantations. 



