We have endeavored to grow our trees so that they should all have from three to five or six main limbs, and any tendency of a limb to assume the leadership is suppressed. A tree grown upon this principle has the faculty of growing a great many laterals, necessitating an annual pruning. As far as possible we prune to prevent laterals from becoming too numerous, from growing so as to overtop or shade lower limbs, to let in light and sunshine, so as to get the maximum amount of color on the fruit and in a measure to help in thinning the fruit. Having in view the idea of an annual crop instead of a biennial one, one essential point always in mind is that we want an open headed tree, and we also wish to insure our trees against blight, and so we eliminate all water sprouts. Apparently, no Minnesota orchard is immune against blight.
Some objections are raised to this type of tree, one criticism being that the tree is structurally weak from the fact that if one limb breaks off at the trunk the tree is about ruined. We offset the possibility of such a break by careful training and by wiring the trees, a plan I gathered some years ago from a Mr. Mason, at that time president of the Flood River Apple Growers Association.
Young trees in full bloom in Mr. Simmons' orchard.
We use No. 14 galvanized wire, a half inch galvanized harness ring, and screw-eyes with stout shanks and small eyes. Locating up the main limbs what might be called the center of effort, or where the main pull would be when loaded with fruit, put in a good stout screw-eye in every main limb, eyes all pointing to the center of the tree, and then wire them all to the harness ring in the middle of the tree. When finished the ring and the wires are like the hub in a wheel with the spokes all around. We tried this first on our N. W. Greening trees, and results were so satisfactory that we have applied it to a great number of other varieties with equal satisfaction. Once put in a tree, it is good for the life of the tree.
Our objection to a tree with a central leader is that it is very difficult to create an open head, and if the blight strikes the leader it generally means the loss of the tree. Low headed trees we have found by experience, are easiest cared for; they are the most economical for thinning, harvesting, spraying and pruning; they also shade the trunk and main limbs.
After pruning all brush is removed from the orchard and burned.
The next operation is spraying, and our first spraying was done when most of the petals were down, using a Cushman power sprayer, running at two hundred pounds pressure, with two leads of hose and extension rods with two nozzles on each. Spraying solution, six gallons of lime and sulphur, twelve pounds of arsenate of lead paste to each tank of water containing two hundred gallons. We aim to cover the tree thoroughly from top to bottom and spray twice each season. However, the past season half the orchard only was sprayed twice, the other half only once, the second spraying being applied about two weeks after the first, when we use lime and sulphur only, and then five gallons instead of six, in each tank of water. We use angle nozzles, the better to direct the spray into the calyxes.
The orchard was mowed twice during the summer, early in June and the middle of July. A heavy growth of clover covers most of the orchard, and none is ever removed, all is left to decay just as it is left by the mowers.
The next thing in line to take our attention is thinning the fruit. The past season we thinned the Wealthy and top-worked varieties only; another season, we expect to carry this work to every tree in the orchard. The trees were gone over twice in the season, although the bulk of the work is done at the first operation. We use thinning shears made expressly for the purpose.