Diquat

Diquat is a contact herbicide that rapidly desiccates the leaves of plants upon exposure. It is used in agriculture and horticulture to control a wide range of weed species. Diquat is also used in aquatic environments to control nuisance aquatic vegetation.

Chemistry[edit | edit source]

Diquat is a bipyridyl herbicide. The chemical formula of diquat is C12H12Br2N2. It is a yellow to brown liquid with a sharp odor. Diquat is highly soluble in water and is not volatile. It is stable under normal storage conditions.

Mode of Action[edit | edit source]

Diquat acts by interfering with photosynthesis, the process by which plants convert sunlight into chemical energy. It is a non-selective herbicide, meaning it will kill most plants it comes into contact with. Diquat is rapidly absorbed by plant tissues and is translocated within the plant but not to a great extent.

Health Effects[edit | edit source]

Exposure to diquat can cause irritation to the skin and eyes. Ingestion can cause nausea, vomiting, and diarrhea. Long-term exposure can lead to more serious health effects such as damage to the liver and kidneys.

Environmental Impact[edit | edit source]

Diquat is highly toxic to aquatic organisms. It can also be harmful to non-target plants if it drifts from the area where it is applied. However, diquat binds tightly to soil particles and is not likely to leach into groundwater.

Regulation[edit | edit source]

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