In planning insect control work, the value of the 

 timber to be protected must always "be given careful considera- 

 tion. The aim will be to treat 100 per cent of the infect eel 

 trees. On the Barkhouse Project on the Klamath National For- 

 est only 86.7 per cent of the infected trees were cut and burn- 

 ed in 1912. The infestation is now nearly, or quite as bad nj 

 the original infestation before the initial control. Control! 

 once begun must be followed up for at least three years to 

 be effective, and after that must be followed by the regular 

 administrative force and occasional trees cut -and burned. 



Crews . 



The organisation of the crew will affect the ef- 

 ficiency and subsequent cost of the whole operation. Prefer- 

 ence shoul \ be given short-term Forest officers, men who have 

 worked previously for the Forest Service, or temporary men wh~> 

 are skilled in some branch of the work, such as felling or 

 peoling ( "lumber jacks") . Statutory men (except in normal in- 

 festations worked by the yearlong administrative force) .shoul'' 

 only be employe.,! as supervising officers or in cases where it 

 is advisable to have rangers become familiar v:ith insect con 

 trol work by forming part of the workinr force- Where it is 



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