Fine tree pruning or tree trimming is recommended for premium quality work with an emphasis on aesthetic considerations in addition to structural integrity. Fine tree pruning or tree trimming shall consist of the removal of dead, dying, diseased, decayed, interfering, objectionable, obstructing, and weak branches, as well as selective thinning to lessen wind resistance.
The removal of such described branches is to include those on the main trunk as well as those inside the leaf area. An occasional undesirable branch up to one-half inch (1.25cm) in diameter, as described above, may remain within the main leaf area to its full length when it is not practical to remove it, when tree pruning or tree trimming.
When tree pruning or tree trimming all cuts shall be made as close as possible to the trunk or parent limb, without cutting into the branch collar or leaving a protruding stub. Bark at the edge of all tree pruning or tree trimming cuts should remain firmly attached.
When tree pruning or tree trimming all branches too large to support with one hand shall be precut to avoid splitting or tearing of the bark. Where necessary, ropes or other equipment should be used to lower large branches or stubs to the ground.
When tree pruning or tree trimming treatment of cuts and wounds with wound dressing or paints has not been shown to be effective in preventing or reducing decay, and is not generally recommended for that reason.
Wound dressing over infected wood may stimulate the decay process. If wounds are painted for cosmetic or other reasons, then materials non-toxic to the cambium layer of meristematic tissue must be used. Care must be taken to apply a thin coating of the material only to the exposed wood.
When tree pruning or tree trimming old injuries are to be inspected. Those not closing properly and where the callus growth is not already completely established should be bark traced if the bark appears loose or damaged. Such tracing shall not penetrate the xylem (sapwood) and margins shall be kept rounded.
more