Triclopyr (3,5,6-trichloro-2-pyridinyloxyacetic acid) is an organic compound in the pyridine group that is used as a systemic foliar herbicide[2] and fungicide.

[3] Triclopyr is a selective weedkiller used to control dicotyledonous weeds (i.e. broadleaf plants) while leaving monocotyledonous plants (mostly bulbs, grasses and conifers) unaffected,[2] or to control rust fungus on soybean crops.

[3] In the USA, it is sold under the trade names Garlon, Remedy, Turflon, Weed-B-Gon (purple label), Brush-B-Gon among others, and in the UK as SBK Brushwood Killer.

It degrades rapidly in water, and remains active in decaying vegetation for about 3 months.

[5] It has been found nontoxic to bees and marginally toxic to fish (rainbow trout LC50 (96 hr) = 117 ppm).