Control work io at the present tino being carried 

 on by the I-orest Service and the Southowi Pacific Company 

 on the Klamath national Forest in yellow pine infested by 

 Dendroctonua brevioomis and the flat~headod borer, The 

 method rsed ia to cut down the infeated trees during the 

 winter, 1-rp rff the bronchos and pile and turn with the 

 ir.feoted trunk. This will kill all beetles in small trees 

 and in the tops of large treea. Tho lower portions of 

 the trunkn of large trees are pooled in order to expose 

 and kill the beetles. Where stunps are also infested they 

 are likewise peeled. 



Entomologist John H. Miller of the Bureau of Ent- 

 omology, who has been connected with the control work on 

 the Klafuath, vicited the Hayfork region during the 3ast 

 of February. He said the damage by barl: beetles and flat- 

 headed borers in the Hayfork valley was the worst he had 

 yet seen. A half -section was cruised near Big Creek Ranch 

 in the region of the heaviest infestation. On this half- 

 section 69 infested trees of a diameter of 12 inches and 

 over were tallied,- In addition to these thore were 

 approximately 200 trees below 12 inches in diameter that 

 were infested. While this average will not hold out for 

 the entire valley, yet it is safe to assume there are 

 1,200 infested trees on the plain and low hills about 

 Hayfork. 



As Mr. Miller pointed out, the only way in which 

 to go about control work is on a basis of natural physio- 

 graphic units. After the infestation by these species io 

 brought under control over a whole watershed it should be 

 safe to assume that we can keep it under control there in 

 the future. To clean out the infested trees over a por- 

 tion of the watershed and leave the balance of the water- 

 shed infested would be like putting out only a portion of 

 a fire,- the infestation would spread back from the infested 

 area to the clean forest. For this reason, although the 

 heaviest infestation is in the Hayfork valley, it would be 

 folly to clean up that part of the watershed where the poor- 

 est of the exposed timber is located and allow the work of 

 destruction to continue on the upper slopes where the more 

 valuable timber is situated. In order to secure effective 

 control it will be necessary to cut out the infested trees 

 over the Hayfork valley and the entire watershed of the 

 Hayfork drainage area above that region^ extending to the 

 divide between Big Creek and Trinity River on the north, 

 to the divide between Hayfork and Browns and Cottonwood 

 Creeks on the east and south* and to the divide between 

 the Salt Creek and Post Creek drainage on the southwest. 

 This includes an area of approximately 164>000 acres. 

 Mr. Miller believes that an estimate of 2,000 infested trees 

 would be conservative for this area. In order to insure 



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