This depends on the tree size copper produces arsenic and thus creates a poison that is transmitted through the tree a small tree may be overwhelmed by the poison and die larger one will probably survive. If you want to kill the tree use rootout apply to the area around the tree and let the tree absorb it and within a few weeks the tree will show signs of dying.
If the tree is still very small, the copper nail will kill it because of the sufficient amount of poison that contains copper. If you want to remove the tree from the area, it is better not to use such methods, otherwise the tree will dry out and fall to pieces, this is not very safe. It’s safer if you just call tree trimming service Bakersfield and they’ll cut the tree down in an hour and clean it all up. That’s what I did in my yard when I wanted to get rid of three old trees. They were really in the way when I was building my garage, so I had to remove them.