Killing Sumac Tree's?

Question

I cut down the sumac tree not knowing that it would keep growing. How do I kill the roots and stump so it doesn't grow back?

Answer 1

cut the tree, expose the inside and spray it with a non selective herbicide. If you want to be safe take the stump and roots  out after they are dead.

Answer 2

There is brush killer that you can spray on them that I think kills the roots and all.