Another reaction to the chemical treating of trees is that new shoots 

 frequently grow from the base of the tree at the ground level. Such sprouting 

 in most cases can be prevented by making the insertions lower down on the 

 tree. The downward action in this case is often sufficient to prevent sprouting. 

 A factor in favor of using the tab insertions is that some continued action 

 remains in and around the insertion pocket which is sufficient to wilt and 

 kill much of the new sprout growth. Here again quite a little variation has 

 been noted among the species. 



Cost in Time and Materials 



Up to 100 three- to five-inch pine trees can be treated in one hour. It 

 took one hour to treat 50 white oak trees of approximately the same size. 

 There are two reasons for this. First, the white oak bark is tougher, and 

 second, more insertions are necessary for a complete kill. Black oak takes 

 longer still, so that the average number per hour is around 30. The cost of 

 the chemical varies with the number of insertions. It amounted to 10 or 15 

 cents per hundred trees in experimental plots. 



Tree Poisoning As a Forest Management Practice 



It has often been stated that the greatest need for developing high-quality 

 timber stands is an economical means of removing the low value or weed 

 species. Tree poisoning offers a good approach to the problem, and the 

 simpler the method the more widespread the practice will become. It may 

 not be necessary to effect complete killing of all trees which are treated. 

 A simple reduction of competition may achieve the purpose. Also the treated 



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The fire hazard increases where slash is not removed when the trees are felled 

 icith axe or sate. After two years the slash is still highly inflammable. 



