well hc sorry about the perceived mud. the thread started with words about your boss being a stupid hack, and as a boss/gc that did push a button. only now 6 days later do we hear that it was a mature pecan that had a big limb taken off, and while that may have been unfortunate, it doesn't tell much more.
Ya want support, here it is, excerpted from June's article with relevant portions highlighted for your convenience. It was not delivered to Moses on Mt. Sinai, but it was reviewed by several peers. highlighting did not transfer so that part is now on you. take it brother may it serve you well!
PRUNING FOR PRESERVATION
“Plan the work, and work the plan” is excellent advice for physically getting around in the tree, and for first mentally planning the work once you get there. “Pruning objectives shall be established before pruning”, ANSI standards remind us. Then, “the arborist shall clearly state what is going to be done to achieve the objective The arborist is most qualified to write the pruning assignment, and specify the methods, as well as the location, density, and size of branches.
These specs are best transferred from supervisor to climber in written form, so nothing is lost in translation. Climbers want to be sure the specs are clear to them before ascending!
Shifting into “tree time” view, the aging process is survival mode, a new and indefinitely long phase in the tree’s development. Research and practice around the world is pointing to a list of criteria for selecting the locations of pruning cuts on older trees. The objective of this article is to examine different methods of pruning, when the objective is longevity.
Shaking branches of shade trees is typically done to free hangers, and it can also be a good way to study biomechanics. Heavy ends dip and pull. The fulcrums of these overextended lever arms are natural targets for pruning cuts.
…Brittle species with sprawling forms, such as Acer saccharinum and Carya illinoinensis, are prone to heavy breakage in storms if they are not lightly reduced, on perhaps a 3-5 year cycle. For any such “leggy” plant, first locate the tallest branch, and select a lower lateral that has room to grow. Cut, repeat with the next tallest branch, then continue until there are no tips sticking out of the crown outline.
Selective reduction cuts generally work best on upward-facing limbs. Upright laterals with an angle of at least 60 degrees, no matter their size, work well as new ends to old branches. Older trees can live indefinitely when declining limbs, even central leaders, are very gradually reduced back to concentrations of vitality.
…Size of wound. is widely agreed to be the key to favorable tree response. Larger cuts expose defenseless older tissue, then cracks extend the infection court toward the heart of the tree. Ironically, removing large limbs to eliminate their risk of failing can, in a disturbingly short period of time, increase the risk of a catastrophic tree failure. The smaller the wound, the less it is forced to sprout, and the sooner it closes.