Scuppernong is a variety of grape vine in the Muscadine family. Scuppernong grapes are golden colored and larger than most grape varieties. The primary use for scuppernong vines is the medicinal value of their seeds, which cultivators sell to drug companies for their purported anti-cancer properties.
Prepare your tools. Sharpen your saw and grafting knife before beginning the grafting process, to avoid interruptions that could result in the wood drying out. The grafting knife must be razor sharp (exercise extreme caution when using it).
Remove the old branches from the grape vines and saw the trunks so that they stand no taller than two feet from the ground.
Select the scion wood from the desired scuppernong vines. Optimal scion wood will be only one year old, disease free, and still be pliable instead of extremely woody. Place the scion wood into a bucket of water for transport to prevent it from drying out.
Prepare the old grape vines for the graft by first sawing two inches off of the trunk so that the wood is freshly cut. Make a 3-inch incision through the center of the trunk with the grafting knife and place a spade into the incision to keep it open.
Cut the bottom of the scion wood into a two inch pie shaped point with the grafting knife. The cuts should be done with smooth downward cutting. Never saw the scion branches or the cambium will be damaged and the graft will not take.
Apply slow gently pressure to the scion while inserting it into the grape vine trunk. Remove the spade once the scion is completely inserted into the trunk.
Cover the entire grafting site with black asphalt emulsion grafting compound. Apply two layers, painting in different directions each time to ensure the entire site is completely covered.
Dilute the latex paint with two parts paint and one part water and paint the graft site. The latex paint further locks in moisture and keeps the graft site cooler.
Continue watering the vines as usual and observe the graft sites for new growth. New growth should appear in eight weeks. If the growth seems slow coming, than strip away half of the branches that are lower than the grafting site to send more nutrients to the new graft.