RE: Best red briar killer
Garlon 3 or 4 is available however it really a professional applicator consentration and costly...Crossbow is same active plus 2,4-D. G-3 is not the same as G-4.
re Sericia...its rather easy to kill with the proper chemical and timing. Most people are learning that serecia, outside of the southeast US, is terrible invasive weed...Kansas has declared it a Noxious weed for example.