Triclopyr

Triclopyr is a systemic, foliar herbicide in the pyridine group. It is used to control broadleaf weeds while leaving grasses and conifers unaffected or to control rust diseases on crops.

Chemistry

Triclopyr is chemically known as [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acid. It is a white, crystalline solid that is soluble in water and most organic solvents. The chemical formula of triclopyr is C7H4Cl3NO3.

Mode of Action

Triclopyr acts by mimicking the plant hormone auxin, causing uncontrolled growth and eventual death of the target plants. It is absorbed by the leaves and roots and transported throughout the plant.

Uses

Triclopyr is used in forestry, range, and rights-of-way management to control unwanted weeds. It is also used in home lawns, golf courses, and other turf areas to control broadleaf weeds.

Environmental Impact

Triclopyr is moderately toxic to birds, fish, and bees. It has low toxicity to mammals. It is not likely to contaminate groundwater due to its low soil mobility.

Health Effects

Exposure to triclopyr can cause irritation to the eyes, skin, and respiratory tract. Ingestion can cause gastrointestinal disturbances.

Regulation

In the United States, triclopyr is regulated by the Environmental Protection Agency (EPA) under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).

See Also

• Herbicide
• Auxin
• Environmental Protection Agency