

san be conveniently handled should be bucked into a pile and 

 turned. Trunks should only be peeled where it is unavoid- 

 ible, on account of the difficulty in peeling. 



Other Species:- Cedars, firs and Douglas fir s/Kmld receive 

 the same treatment as yellow pine, but infestations in these 

 species are not being treated at present. 



Pines, especially sugar pine, are often infested 

 without showing any signs at the base of the tree. If the 

 yellowing only extends one-quarter or less from the tip of 

 the crown wifh a definite line of demarcation between the 

 yellow and green of the foliage, the infestation has been 

 found to be caused by Ips and che tree will probably recover 

 if a large one. If the yellowing is nore than one-quarter 

 from the tip of the crown, or the crown shows signs of yel- 

 lowing further down than one-quarter, it is a good indica- 

 tion of Pendroctonus work and the tree should always be cut. 

 -In the former case trees over 18" in diameter shotild not be 

 cut, especially in yellow pine, where it seems reasonable 

 that the Ips may attack young growth, tr trees under 18" in 

 diameter, the second year and be burnec 3 in the cleanup at 

 much less expense both in labor and timber \vascecl- 



Parts of felled trunks of trees which are nat in- 

 rested must have the bark sufficiently burned to insure it 



-49- 



