It will negatively effect the tree in some way, tho' probably not kill it
outright. It does malform the internal plumbing of the trees vascular
system - true - in time the tree will completely oergrow it reform these
vascular connections to some degree. In some species this sort of insult
seems less problematic - i.e. London plane, some oaks, some hard pines. In
others such as birch, dogwoods, white pines, maples this can be the start of
a big problem. The issue is that for years the tree is not only hobbled by
poor circulation (especially problematic when the ligature is and the main
trunk near the ground), but that it is also open to infection and
infiltration, it is exuding rich sap to attract saprophytes than can become
pathogens, and it attracts insects that usually are not attracted.
I would remove the wire ASAP even if you have to use a needle-nose snipper
and take it out in pieces.
Mike LaMana, MS
Heartwood Consulting Services, LLC
Click to see the full signature.