' 



Fall Work Spring Work 



Advantages Advantages 



2. V/ork may "be terminated by 2. Trees eaeily spotted, 

 rain or snow, and there- (Almost, if not all, 

 fore insects "/ill n^t fly have turned yellow). 

 until spring. 



Probably the best and most economical method is to begin work 

 on insect control projects in the spring, following up the 

 work in the fall. VTork must never be commenced with deep 

 snow on the ground on account of the difficiilty of moving 

 camps and burning and collecting bark. 



Llethods of Control, 



Various methods of control have been employed, 

 such as cutting the tree and peeling the bark, peeling the 

 berk-irom standing trees, and cutting the tree and burning 

 it. The last method is the only one which kills the insects 

 at all times and, as is obvious, it is the only method which 

 eliminates the fire danger resulting from dead material both 

 standing and down. Methods which destroy the primary .bark- 

 borer and not the numerous secondary borers seem faulty. The 

 only method which will be employed in District 5 is the one 

 which ic most thorough from a broad protection standpoint s 

 that of cutting the tree and burning bark, top and branches, 

 leaving only the scorched trunk on the groxind. As this perl- 

 ed trunk is slightly charred, it will remain sound for some 



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