Aminopyralid

Aminopyralid is a selective, systemic herbicide used for the control of broadleaf weeds in grassland and other non-crop areas. It is a member of the pyridine group of herbicides, which also includes clopyralid, picloram, and triclopyr. Aminopyralid is particularly effective against members of the Asteraceae family, such as thistles and daisies.

Chemistry

Aminopyralid is a synthetic compound of the pyridine group. Its chemical formula is C₆H₃Cl₂N₃O₂. It is a white, crystalline solid at room temperature, with a melting point of 151-152°C. It is soluble in water and most organic solvents.

Mode of Action

Aminopyralid works by mimicking the action of the plant hormone auxin, causing uncontrolled growth and eventually death in susceptible plants. It is absorbed by the leaves and roots and transported throughout the plant.

Use

Aminopyralid is used to control a wide range of broadleaf weeds, including thistles, daisies, and dock. It is used in grassland, such as pastures and meadows, and other non-crop areas, such as roadsides and industrial sites.

Environmental Impact

Aminopyralid is persistent in soil and can affect non-target plants for several years after application. It is toxic to aquatic organisms and can contaminate water bodies through runoff. It is also harmful to bees and other pollinators.

Health Effects

Exposure to aminopyralid can cause skin and eye irritation in humans. Ingestion or inhalation can cause nausea, vomiting, and respiratory distress.

Regulation

The use of aminopyralid is regulated in many countries due to its environmental and health effects. In the European Union, it is approved for use under strict conditions.

See Also

• Herbicide
• Pyridine
• Auxin

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