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Triclopyr is in the pyridine carboxylic acid family, with a synthetic auxin mode of action leading to abnormal growth, particularly at the apical points, and eventual death. It is a broadleafed and woody plant-selective herbicide with some sensitivity to warm-season grasses, including kikuyu grass (Pennisetum clandestinum). It is effective on many legume species. Registered commercial products are available in amine and ester formulations. Amine formulations are best for water-carrier applications (i.e., foliar and cut injection). Ester-based formulations are more compatible with oil carriers in basal bark and cut-surface applications. Drift injury from foliar applications may be more prevalent with the ester formula- tions due to the higher potential for volatilization. Registered products include Garlon® 3A (amine at 3 lbs ae/gal, EPA reg. no. 62719-37), Garlon® 4 Ultra (ester at 4 lbs ae/gal, EPA reg. no. 62719-527), Remedy® Ultra (ester at 4 lbs ae/gal, EPA reg. no. 62719-70, Renovate 3 (amine at 3 lbs ai/gal, EPA reg no. 62719-37-67690), Element 4 (ester at 4 lbs ae/gal, EPA reg. no. 62719-040).

  • Synopsis

  • Herbicide Details

    • Chemical Formula

    • Trade Names

    • Manufacturers

    • Use Against Natural Area Weeds

    • Mode of Action

    • Dissipation Mechanisms

      • Volatilization​

      • Photodegradation

      • Microbial Degradation

      • Adsorption

      • Chemical Decomposition

    • Behavior in the Environment ​​

      • Soils​

      • Water

      • Vegetation 

    • Environmental Toxicity ​​

      • Birds and Mammals​

      • Aquatic Species

      • Other Non-Target Organisms

    • Application Considerations

      • Application Under Unusal Conditions​

    • Safety Measures

    • Human Toxicology

    • References

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