Aclonifen

Aclonifen is a selective herbicide used for the control of broad-leaved weeds in various crops. It is a member of the diphenyl ether group of herbicides, which also includes fomesafen and oxyfluorfen. Aclonifen works by inhibiting the enzyme protoporphyrinogen oxidase, which is essential for the synthesis of chlorophyll in plants.

Mode of Action

Aclonifen acts by inhibiting the enzyme protoporphyrinogen oxidase (PPO), which is involved in the synthesis of chlorophyll, the green pigment in plants that is essential for photosynthesis. This inhibition leads to the accumulation of protoporphyrin IX, a highly reactive compound that causes cell damage when exposed to light, leading to the death of the plant.

Use in Agriculture

Aclonifen is used in the control of broad-leaved weeds in a variety of crops, including cereals, oilseed rape, potatoes, and sugar beet. It is applied pre-emergence or early post-emergence, and is effective against a range of weed species, including chickweed, mayweed, and poppy.

Environmental Impact

Like all herbicides, aclonifen has the potential to impact non-target organisms and the wider environment. However, it is considered to have a low risk of leaching into groundwater due to its low solubility and strong adsorption to soil particles. It is also rapidly degraded in soil, with a half-life of less than 10 days.

Safety and Regulation

Aclonifen is approved for use in the European Union and several other countries. It is classified as low toxicity for mammals, but can cause eye irritation. Users are advised to wear protective clothing and avoid contact with skin and eyes.

See Also

• Herbicide
• Protoporphyrinogen oxidase
• Photosynthesis