Hi all,

In a previous career as a tree surgeon we were often asked to kill or remove stumps.
The most effective way is to cut a groove in the cambian layer (the area of growth inside the bark) this layer holds the tree's vascular system. Put a systemic herbiced in the groove. Then place a bin liner over the stump tp stop rain washing it off or animals getting to it.
As the groove has been cut in the cambian layer the vascular system will help to take the herbiced into the root system.
This method has had 100% success everytime i have used it.

Unfortunately the copper nail method is false.

If you dont have a chainsaw to make the groove, drilled holes will do, but be sure they intersect the cambian layer.

HTH