Benfluralin

Benfluralin is a herbicide used in the control of weed growth. It is a member of the dinitroaniline class of herbicides, which act by inhibiting cell division in the roots and shoots of emerging plants. Benfluralin is used primarily on crops such as soybeans, cotton, carrots, and lettuce.

Chemical Structure and Properties

Benfluralin has the chemical formula C13H16F3N3O4 and a molecular weight of 345.28 g/mol. It is a yellow-orange crystalline solid with a slight aromatic odor. It is insoluble in water and has a low volatility.

Mode of Action

Benfluralin acts by inhibiting the polymerization of tubulin, a protein necessary for the formation of the mitotic spindle in dividing cells. This prevents cell division and thus, the growth of the plant. It is most effective when applied to the soil before the weeds have emerged.

Toxicity

Benfluralin has a low acute toxicity to mammals. However, long-term exposure can cause liver and kidney damage in rats. It is also toxic to some species of fish and aquatic invertebrates.

Environmental Impact

Benfluralin is moderately persistent in the soil, with a half-life of 2-12 months. It has a low potential for leaching into groundwater due to its strong adsorption to soil particles. However, it can be harmful to non-target plants if not applied correctly.

Regulation

In the United States, benfluralin is classified as a Restricted Use Pesticide (RUP) by the Environmental Protection Agency (EPA). This means it can only be sold to and used by certified applicators.

See Also

• Dinitroaniline
• Herbicide
• Environmental Protection Agency