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Herbicide Summary - Garlon® 3A

Controls woody plants, broadleaf weeds, and vines; broadcast treatments for site preparation and release of spruce, fir, red pine, and white pine.

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Updated:

January 26, 2023

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Herbicide application; Photo by vvoennyy via DepositPhotos

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Common Name: Triclopyr- 44.4%; Acid equivalent - 31.8% (3lb/gal)

Formulation: Water-soluble liquid (amine salt)

Signal Word: Danger

Toxicity: Slightly toxic; oral LD (50): 4,464 mg/kg for males, 4,183 mg/kg for females

Use Classification: General Use

Minimum Required Personal Protective Equipment: Long-sleeved shirt, long pants, shoes, socks, protective eyewear, and chemical-resistant gloves

Carriers: Water

Activity: Absorbed through foliage or cut surface

Mode of Action: Acts as a systemic herbicide that deregulates plant growth metabolic pathways; accumulates in the plant meristems (growth regions), causing uneven cell division and growth

Selectivity: Little or no impact on grasses

Precautions: Can cause irreversible eye damage; use eye protection when mixing and handling concentrate; do not use in areas with permeable soils or shallow water tables; groundwater contamination may result

Application Methods: Foliar spray, cut stump, stem injection, frill girdle

Manufacturer: Corteva Agriscience

Agenda

Authors

David R. Jackson

Former Extension Educator, Renewable Natural Resources

Pennsylvania State University