If they're girdled or dead above the graft they're useless unless you know how to graft. If your trees are being girdled you can make simple guards from 1 1/2" plastic sump or pool hose. Cut the hose into 2-3 foot lengths and then slit it downone side. The guards pull open and fit around the tree trunks. You can move up to 4" drainage hose as the trees get larger.

Dan O.