(180 



JOURNAL OF FORESTRY 



those recommended for similar methods of cutting on other types of 

 forest in this region and previously discussed. 



Table I. — Host Index 

 (See also U. S. D. A. Bulletin No. 658) ^^ 



Western white pine {Pinus monticola). 



Trametes pini (ring-scale fungus). 



Polyporus schweinitzii (Velvet-top 

 fungus). 



Fomes annosus (root fomes). 



Armillaria mellea (honey mushroom). 

 Western yellow pine (Pinus ponderosa) . 



Trametes pini. 



Polyporus schweinitzii. 



Fomes laricis (chalk fungus). 



Cronartium filamentosum (pine rust). 



Cronartium pyriforme (pine rust). 



Cronartium sp. 



Razoumofskya campylopoda (yellow- 

 pine mistletoe). 

 Lodgepole pine (Pinus contoria). 



Trametes pini. 



Polyporus schweinitzii. 



Cronartium filamentosum (pine rust). 



Cronartium pyriforme (pine rust). 



Cronartium sp. 



Razoumofskya americana (lodgepole- 

 pine mistletoe). 

 Western larch (Lari.r occidentaUs). 



Trametes pini. 



Fomes laricis. 



Polyporus schweinitzii. 



Polyporus berkeleyi. 



Razoumofskya laricis (larch mistle- 

 toe). 



Douglas fir (Pseudotsuga ta.xifolia). 

 Polyporus schweinitzii. 

 Trametes pini. 



Polyporus sulphureous (sulphur fun- 

 gus). 

 Razoumofskya douglasii (douglas fir 

 mistletoe). 

 Engelmann spruce (Picea ciigehnaiuii). 

 Trametes pini. 

 Polyporus schweinitzii. 

 Poria subacida. 

 Fomes annosus. 



Melampsorella sp. (spruce rust). 

 Melampsoropsis pyrolae (spruce-cone 

 rust). 

 Western red cedar (Thiija plicata). 

 Poria weirii (brown-cedar poria). 

 Polyporus schweinitzii. 

 Trametes pini. 

 Western hemlock (7'suga heterophylla). 

 Mountain hemlock (Tsuga inertens- 

 iana). 



tinctorium 



Echinodontium 



paint fungus) 

 Fomes annosus. 

 Razoumofskya 



mistletoe). 

 Grand fir (Abies grandis). 

 Echinodontium tinctorium. 

 Fomes annosus. 

 Razoumofskya douglasii. 

 Pholiota adiposa. 



(Indian- 



tsugensis (hemlock 



SUMMARY 



This paper presents the urgent need of forest sanitation in most of 

 the timber sales conducted in Idaho and Montana, with special refer- 

 ence to the western white-pine type of forest. The rules are intended 

 to cover the removal of all infected trees upon the area which, if left, 

 would act as a menace to the remaining or future stands. Special at- 



