Choose a propagating container that is at least 8 inches in diameter. Fill it to within 2 inches of the rim with a quality soilless mix. A mix labeled for seed starting is ideal. Water the planting medium until it is consistently moist.
Use the shovel to dig into the soil 2.5 feet from the base of the giant persimmon tree. Dig carefully until you see the roots, and use your hands to brush the soil away from the roots. Look for a root that is the diameter of a pencil, and use the shears to snip off a 6-inch length. Wrap the root in a wet paper towel.
Place the root in a bag and add enough fungicide powder to cover it. Close the bag, shake it gently and remove the root.
Lay the root cutting horizontally on the planting mix in the container and cover it with 1 inch of the mix. Slip the container into a plastic bag and seal it.
Set the container where it will receive bright but filtered sunlight. Water it occasionally to keep the soil lightly moist. The persimmon root cutting should root within six to eight weeks.