Another Imotty problem encountered was the determi- 

 nation as to just how far v/o should o in tlio narlrinr; of im- 

 mature troes affected "by inistlotoe or other diseases. It 

 has "been the preset ico in the past to treat such trees in 

 about the came way as trees free from diseases are treated. 

 In the Sierra nar'.-inr, however, it was decided that for the 

 Good of the T'orest all morohanteblo trees affected "by mis- 

 tlotoe should bo removed e::cept undnr very unusual conditions 

 whore such removal would result in leaving no seed trees 

 at all upon a:i area where they wore apparent^ needed and 

 whero it ?/as clearly evident that unless they v/ere left the 

 result would "be a pormaient "blanlr in forest cover. This 

 practice has "been justified "by Dr.Moineolie who has recent- 

 ly determined from careful observations that mistletoe 

 spreads with considerable ra;;>idity, ospeciall^r from large 

 trees to surrou din.^ reproduction within a radius of SO to 

 40 feet from the "base of the infested tree, This results 

 in the death of a portion of this reproduction. In the 

 cases observed "by Dr.Mei:iec::e E5^ of the reproduction was 

 affected and about &fo ha<l "been :iilled. 



Careful attention v/as given to the margins of all 

 snags 20 feet or more in height, hoth as a hygienic measure 

 and to prevent the spread of sparlis in case of fire. 0?his 

 practice has now be o one a well established one and observa- 

 tions made by DrMeiiiec-::e indicate clearly that it is 



228 



