Figure 8. — View of a portzon 

 of the Moody Meadows 

 stand on the Tar ghee 

 National Fores t^ 

 showing stumps and 

 treated trees from the 

 1946 control effort. 

 Note the denser clump 

 of smaller trees in 

 the background. 



created in the earlier infestation. The released trees have continued to grow well to 

 the present time, but trees in other parts of the stand showed signs of growth reduc- 

 tion for several years prior to 1967. Significant release has not yet become apparent 

 from the thinning caused by the current infestation. 



Losses to other causes are proportionately greater in the smaller trees as illus- 

 trated in figure 6. Few trees below about 6.5 inches were killed by the mountain pine 

 beetle. This stand near Moody Meadows can still sustain a number of beetle infesta- 

 tions. Mortality has been light, probably because of the small size and thin bark of 

 the trees. However, further growth of residual trees will provide suitable trees for 

 future infestations. 



A subalpine fir understory of about 29 trees per acre averages 2.62 inches in 

 diameter and ranges from 1- to 7-inch trees. In addition, 1,115 subalpine fir seedlings 

 5 inches high to 1 inch d.b.h. per acre are growing in the stand which will fill the 

 overwood openings as they are created by future beetle infestations (figure 10). The 

 subalpine fir distribution by diameter classes simulates a J-shaped curve thereby 

 demonstrating succession of lodgepole pine by subalpine fir. 



Pilgrim Mountain . --This stand of lodgepole pine is in the northwestern part of the 

 Teton National Forest bordering the Teton National Park. It is currently infested with 

 its first known attack of mountain pine beetles. The stand contains 492 trees per acre 

 that are 1 inch and larger in diameter. The age of the residual trees 4 inches d.b.h. 

 and larger ranges from 33 years to 113' years with a mean age of 76 years. The distri- 

 bution of trees by diameter groups is shown in figure 6 and stand basal areas are 

 sho\m in table 4. The overwood includes trees up to 21 inches in diameter although all 

 lodgepole pine trees 18 inches and larger have been killed in the current beetle 

 infestation. Furthermore, trees down to and including 6.6 inches d.b.h. have been 

 killed as shown in figure 4. Losses caused by factors other than the mountain pine 

 beetle are proportionately greater in the smaller d.b.h. classes. 



At present, no well defined release effect is evident in the diameter trends for 

 the Pilgrim Mountain stand, and diameters show a steady increase through the life of 

 the stand. 



13 



