Picloram

Picloram is a systemic herbicide used for general woody plant control. It also controls a wide range of broad-leaved weeds, but most grasses are relatively tolerant. The compound is absorbed through the leaves and roots, and moves throughout the plant to kill it. It is used on rangeland, permanent grass pastures, and non-cropland areas.

Chemical Structure

Picloram is a pyridine derivative, and is chemically known as 4-amino-3,5,6-trichloropicolinic acid. Its molecular formula is C6H3Cl3N2O2.

Uses

Picloram is used to control a wide range of broad-leaved weeds and woody plants. It is used on rangeland, permanent grass pastures, and non-cropland areas. It is also used for industrial weed control and for the control of trees in forestry.

Health Effects

Exposure to picloram can cause irritation to the eyes, skin, and respiratory tract. It can also cause nausea, vomiting, and diarrhea if ingested. Long-term exposure can lead to weight loss, liver damage, and changes in blood chemistry.

Environmental Effects

Picloram is highly persistent in soil and water, and can leach to groundwater. It is highly toxic to aquatic organisms and can cause long-term adverse effects in the aquatic environment.

Regulation

In the United States, picloram is classified as a Restricted Use Pesticide (RUP) due to its potential to leach into groundwater and its toxicity to non-target aquatic organisms.

References

Picloram Resources
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