Time to Prune.
Pruning may be done at any convenient time, but the best period is probably either just before the flow of sap in spring, or just after the trees have fully developed their leaves in spring. Following the removal of branches of any considerable size—three-quarters of an inch and upward—the wounds should be carefully painted over with white lead paint to prevent decay.
Care of Broken Trees.
When trees are broken or injured by wind-storms, the broken branches should be cut off and the resulting wounds carefully trimmed and painted. If the branches are only partly split off, the injury may be repaired, in many cases, by pressing the branch back into place and bolting it there, so as to hold it firmly in place. Trees with forked trunks should be protected by passing a bolt through the two branches some distance above where they divide to prevent splitting.
Nursery Root-Pruning.
Too frequently the root system of pecan trees, intended for planting, is but poorly developed. The root consists almost entirely of one large taproot destitute of laterals. Such trees are slow in starting and are hard to transplant. Figure 33 shows an excellent root system on a nursery tree. Such a tree should be almost as easily transplanted as an apple tree. A little more care on the part of nurserymen would insure good root systems.
In a former publication it was suggested that the young seedlings intended for stocks be root-pruned "in the fall, after the trees are one year old. It could easily be accomplished by running the tree-digger down the row at a depth of nine or ten inches. The taproots could thus be severed, and the following spring, or summer, the trees could be worked (budded or grafted). This course of treatment would insure greater success in transplanting, as it would have a tendency to develop the lateral roots; and in addition to that, it would, in all probability, induce earlier fruiting."
Root Trimming Before Planting.
Two year old taproots should be cut to eighteen or twenty-four inches; larger ones, in proportion. The old idea that transplanted pecan trees, the taproots of which have been cut back, will not live and bear, is not borne out by experience. They are in no-wise injured by its partial removal, and it might all be removed were it not that so many would die in transplanting.
