673 JOURNAL OF FORESTRY 



importance are Trainetes pini, Polyporus schu'einitzii, and Foiiies an- 

 nosiis. The rots in the western white pine studies were classed under 

 two heads, viz., butt rot and trunk rot. These two were combined in 

 securing the above infection ages. The main trunk rot fungus is 

 T. pini. P. schweinitsii and F. annosns were both included as causing 

 butt rots. 



It will be found helpful to list under each tree species the most im- 

 portant fungi to be encountered in the various forest types of this 

 region. Accordingly, Table i has been prepared for this purpose. The 

 fungi-causing diseases are listed in the order of their importance, and 

 the common names are given following the first mention of each fungus 

 species. For further information see U. S. Department of Agriculture 

 Bulletin No. 658, listed in the bibliography. 



Provisions are made in timber-sale contracts for the removal of all 

 merchantable material between specified diameter limits. Logs of the 

 more valuable species scaling 33^ per cent of the gross scale sound and 

 50 per cent in the case of logs of inferior species are removed by the 

 purchaser. In many contracts a special clause requires the purchaser 

 to cut and utilize the merchantable portion of "all living and dead de- 

 fective trees which, in the judgment of the forest officer, contain one or 

 more. merchantable logs scaling one-fourth of the total volume of the 

 tree." (Standard clause 21.)^- 



Such requirements, which are more in the nature of close utilization 

 clauses than sanitation clauses, take care of a considerable number, if 

 not the majority, of infected trees upon the sale area. The infected 

 trees which are both above and below the diameter or cutting limits and 

 those which are entirely unmerchantable and are not required to be cut 

 under the contract are the trees which concern vis most in this discus- 

 sion.^ The object of this paper is to provide for the cutting of all in- 

 fected trees which may be considered dangerous if left upon the sale 

 area. If the marking rules satisfactorily provide for this object, then 

 the further removal of the infected slash left upon the area after log- 

 ging can be considered under another operation — that of brush disposal. 



In discussing methods and means for the cutting of all unmerchant- 

 able infected trees, it is well to consider the part played by the purchaser. 

 Standard sanitation clauses in timber-sale contracts ordinarily place the 

 burden of execution upon the purchaser, who in most cases does not see 

 the justification for these special provisions and therefore is not con- 

 scientious in carrying them out. For this reason better results will be 

 obtained if the Forest Service assumes directly the expense of the sani- 



