put road salt around the tree roots
copper nails are better as they go out of site
but a cordless drill and glyphos isnt
Plenty comediens
Try rubbing it with half an orange. Works on some sap. Used it when my hands were blackened cutting cyprus laylandi back. Th eacid in the orange soffened the gum to release it. Found out by accident when I was pealing an orange and found my hands clean. Must have ate the sap with the orange,
Jim