Posted: 02/08/2014 at 11:51
Rhus typhina is a thug. Cut it down, prune it or damage it and it will sprout everywhere.
I would recut the main trunk and every piece of stem and apply sbk brushwood killer. To help, drill holes or gouge out hollows to enable weedkiller to "pool" there.
Where you see suckers spray with super strength glyphosate, not usual sort. If in a lawn paint,the suckers carefully to avoid contact with the grass.
Every sucker must be treated. Keep alert to future suckers and do same thing. Persevere and you will kill this thug.