what kills tree
if you want too kill the tree before you cut it down,make sure there are no other tree's in the area that you do not want to kill.purchase an auger type bit used for bulb's,drill around tree 10-12 feet from trunk 10-12 inches deep, pour half full with rock salt,fill with water and that will do the trick.
Herbicides applied directly to the soil surface are carried down into the root system with rainfall or watering. The chemicals kill the roots when they come into direct contact with them. Chemicals that work in this way include bromacil, hexazinone and tebuthiuron.