UNITED STATES DEPARTMENT OF AGRICULTURE 



(From the Forest Service, lH-flt T S*;^^ c f e par tine nt of Agriculture, 



San Francisco Office) 



WAGE WAR ON 

 PIUE BE2TLES 



Five thousand dollars will be expended on the Sierra 

 National Forest in Iladera County this spring in the extermination 

 of beetles which are killing valuable timber. Nearly 3,OCO big 

 pines, \vorth '512,000, are reported killed by insects 'Vi the areas 

 involved in this project, during the past year, and prompt measures 

 are expected to save a. body ^f timber worth man;y times the amount 

 expended. 



It is explained that the beetles do thzrir work by tun- 

 neling horizontally beneath the bark in -che ruter layer of living 

 wood which carries the food supply to the living portions of the 

 tree. If the tree is completely girdled it dies; if only partly 

 girdled its vitality is so weakened that it may fall a prey to 

 other diseases. Control work consists in cutting the infested 

 trees before the beetle emerges, peeling the bark and burning it, 



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