

HOSTJPKFTS - IN SECT 3 . 



Pseudotsuga taxifoiia (Douglas fir) Melanophilp. drunniondi 

 ^bies conoolor (White fir) (I>ir Flat he ad Borer) 

 Abies magnifica (Red fir) 



Pi mis ponderosa (Yellow -pine) Ips oonfusus 



lambertiana (Sugar pine) (Five Spiaecl Engraver) 



Pinus contorta (Lodgepole pine) Ips concinnus 



(Lodgepole Engraver) 



Abies conoolor (White fir) Tetropium abietis 



magnifica (Reel fir) (Fir Roundhead Borer) 



Pseudctsuga taxi- (Douglas fir) Jccoptngaster unispinosus 

 folia (Fir Gircller) 



libocedrus decurrens ( Incense cedar) Chrysobothris nixa 



(Plathead Borer) 



Libocedrus decurrens (incense cedar) Phloeosinus, n. sp. 

 Abies concolor (White fir) Hyle sinus, n. sp. 



The following tables give the most injurious insects 

 found on each species of tree with the common names, if there 

 are any. Many of them do not have corar.ion names, or only a 

 general common name. When Forest officers become familiar 

 ^ith certain insects killing trees, it is better to use scien- 

 tific names. The first named of the insects is the most des- 

 tructive and the others follow in the order of importance; 



Primary Insects > 



Sugar Pine 



(Pinus lambertiana) 



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