after the first rain in the fall. All material cut for use 

 in ca"bin construction, etc,, should be peeled. This in- 

 creases the life of the log and also prevents infestation. 

 If left unpeeled, this material vrould he apt to breed in- 

 sects which would develop and emerge diiring a late warm 

 period in the fall. 



Trees broken by wind or snow, or injtired by light- 

 ning are fruitful causes of infestation, and should be burned 

 whenever found infested. All large areas of snowbreak should 

 be reported to the District Office in order that they may be 

 inspected and a plan of treatment recommended. 



OUR PRINCIPAL INSECT SaSIIIF.S . 



Forest insects may kill trees outright, nay only 

 weaken or set them back, nay prey on the injurious insects 

 or fungi found on them, or may be truly parasitic on these 

 insects. Many insects found on trees must at present be 

 classed as neutral insects, because, as far as we now know, 

 the y are neither helpful nor harmful. They often live on 

 the s->ur sap, excrement in galleries of other beetles, etc. 



It is impossible and unnecessary for Forest Of- 

 licers to have a complete knowledge of all of the different 

 species found on each tree. The yellow pine alone has Over , 

 25 injurious species and is host of at least that many more. 



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