38 BI7LLETIX 1264, U. S. DEPARTMENT OF AGRICULTURE. 



WESTERN LARCH (Larii occidental is). 



Western larch is native to only the extreme northern part of the 

 region. It was not planted experimentally within its natural range. 

 Although an arboretum plantation of 2-2 stock made in the fall of 

 1912 averaged 32 inches tall, and had a survival of 50 per cent of 

 vigorous trees eight years later, it can be seen from Table IS that it 

 has given very poor results in the other tests. Even though this 

 species has shown very little frost or snow-molding injury, its use 

 in Utah in preference to native conifers is still very questionable. 



JACK PINE (Pin us diraricata). 



Jack pine, although reaching its best development in the Lake 

 States region, has been given a limited test in the intermountain 

 region. The poor results shown in Table IS for this species were 

 mainly due to its failure to withstand the dry part of the growing 

 season and to the high mortality caused by the snow-molding fungi. 

 During one winter the mortality on one plantation was increased 

 from 52 per cent caused by drought the preceding summer to 94 

 per cent due to snow molding. The results secured with jack pine 

 clearly indicate that it is entirely unsuited to the climatic conditions 

 of the region, and that it should not be used in reforestation. 



AUSTRIAN PIXE (Finns austriaca). 



Austrian pine, although native to central Europe, has been planted 

 to some extent in this region, but the results as shown in Table IS 

 are generally inferior to those secured with western yellow pine 

 (Table 10)/ Its outstanding characteristics and behavior were in 

 many cases similar to the latter species but with a general inferiority. 



SCOTCH PIXE (Pinus sylcestris). 



Scotch pine, a native of Europe, has been planted on a small scale, 

 with some success. A plantation established in 1909 averaged 37 

 inches 11 years later. This species showed intolerance of shade, 

 also difficulty in surviving on open dry sites. This species appears 

 entirely frost-hardy and "fairly immune to snow molding, but the 

 heavy weight of the snow results in considerable injurious breakage. 

 The growth of the surviving individuals in the open was above the 

 average of all species tested, but was insufficient to recommend it 

 for planting in the region. 



OTHER COXIFERS. 



Jeffrey pine (Pinus jeffreyi) was tested in two plantations, one of 

 which was planted hi sagebrush and resulted m a failure. The 

 other one was successful. At the end of the fourth year, following 

 planting, the living trees averaged 13.5 inches high. The plantation 

 made no growth during the first year and very little during the second. 

 Although Jeffrey pine showed no indications of frost or snow-molding 

 injury, it has no other merits to recommend it for planting in the 

 region in preference to native species. 



