We have what we affectionately call "red rippers" - they really establish in open fields after a crop like corn - (2-4 years). They are a Blackberry Species, I think - the stems are a ruby red. I've never tried to properly identify the species
As I have previously stated, these "briars" are NOT multi-flora rose. But I figure if a chemical will kill Multi-flora, it will kill anything. Than you all for your response.
OhioDuckHunter