(cross-posted)
I don't know how effective it will be against your weed-from-Heck, but I saw this:
"Products that contain triclopyr often contain other herbicide active ingredients such as 2,4-D and clopyralid."
That kind of hints that the nastier chemicals like 2,4-D may be more effective. Of course, they are also much longer-lasting in the soil and water, so they are more likely to be in fine print on the label.
http://www.kellysolutions.com/...
Active Ingredients in Bayer Advanced Brush Killer Plus Ready-to-use [ 72155-22 ]
Chemical Name Triethylamine triclopyr 0.8 %
http://npic.orst.edu/factsheet...
"Triclopyr is a selective systemic herbicide that mimics the effects of plant hormones (auxins) (2)."
A World Compendium: The Pesticide Manual, 12th ed.; Tomlin, C. D. S., Ed.; British Crop Protection Council: Farnham, UK, 2000; pp 933-934.
It looks like it has has very low toxicity to mammals, fish, bees and insects (for an herbicide) and breaks down in soil or water with a half-life around 45 days depeneding on many factors. One metabolite is moderately toxic, but it also breaks down at around the same speed in soil and water. The animal testing they've done looks to me like it's not very toxic at all, especially for an herbicide.
Synonyms for Active Ingredient: Triethylamine triclopyr:
3,5,6-Trichloro-2-pyridinyloxyacetic acid, TEA salt
Acetic acid, ((3,5,6-trichloro-2-pyridinyl)oxy)-, compd. with ,N-diethylethanamine (1:1)
Triclopyr, triethylamine salt
Triethylammonium triclopyr
