Fomesafen

Fomesafen is a herbicide that belongs to the diphenyl ether group of herbicides. It is primarily used for the control of broadleaf weeds in soybean crops. Fomesafen is a selective, post-emergence herbicide, which means it is applied after the weeds have emerged from the soil. It is absorbed by the leaves and roots of the plants and inhibits the process of photosynthesis, leading to the death of the plant.

Chemical Properties

Fomesafen is a white crystalline solid with a slight aromatic odor. It is slightly soluble in water and readily soluble in most organic solvents. The chemical formula of fomesafen is C₁₅H₁₀ClF₃N₂O₆S. It has a molecular weight of 438.77 g/mol.

Mode of Action

Fomesafen acts by inhibiting the enzyme protoporphyrinogen oxidase (PPO), which is involved in the synthesis of chlorophyll, the pigment responsible for photosynthesis in plants. Inhibition of PPO leads to the accumulation of protoporphyrin IX, a compound that is toxic to the plant when exposed to light. This causes cell membrane damage and eventually leads to the death of the plant.

Usage

Fomesafen is used for the control of broadleaf weeds in soybean crops. It is applied post-emergence, after the weeds have emerged from the soil. The herbicide is absorbed by the leaves and roots of the plants and transported to the growing points, where it inhibits photosynthesis.

Safety and Environmental Impact

Fomesafen is classified as a Category II pesticide by the Environmental Protection Agency (EPA), indicating moderate toxicity. It is harmful if swallowed, inhaled, or absorbed through the skin. It is also toxic to aquatic organisms and may cause long-term adverse effects in the aquatic environment.

Chemical structure of fomesafen

See Also

• Herbicide
• Diphenyl ether
• Protoporphyrinogen oxidase
• Photosynthesis
• Soybean