Beth writes
Unfortunately, there are not many products labeled for greenbriar vines. A non selective such as Glyphosate 41% and Triclopyr are recommended for direct applications to freshly cut vines and stump applicaitons. Hi-Yield Triclopyr Ester is only labeled for broadleaf weeds in cool season turfgrasses.
Fertilome Brush Killer and Stump Killer containing Triclopyr would be recommended for direct treatments to cut vines, woody brush and stump applications. For treating greenbriar in pastures, PastureGard HL is labeled to treat greenbriar vines. Please view the full product label for more information.
This article by the University of Georgia Extension mentions that the best time to treat is in the spring when the leaves are fairly young. If vines are well established, it will take multiple applications to control it.
Answer last updated on: 08/18/2021