Diclofop-methyl(D)

White to off-white solid, melting point 39-41°C, boiling point 173-175°C (0.1 mbar)

It is a systemic herbicide, absorbed through roots and leaves, mainly used in wheat, soybeans, peanuts, oilseed rape and other crops to control grass weeds.

Diclofop-methyl is a selective post-emergent herbicide primarily used to control annual grass weeds in cereal crops such as wheat and barley. Belonging to the aryloxyphenoxypropionate (AOPP) chemical family, it is highly effective against grasses like wild oats (Avena fatua) and foxtail (Setaria spp.) without harming the main crop.

Key Features

1. Selective Grass Control: Targets grass weeds while sparing broadleaf crops.

2. Post-Emergent Application: Effective against actively growing weeds.

3. Systemic Action: Absorbed through leaves and translocated to roots for complete weed kill.

4. Wide Compatibility: Suitable for use in various cereal crop systems.

Applications

Crops Treated

• Wheat

• Barley

• Rye

Weeds Controlled

• Wild oats (Avena fatua).

• Green foxtail (Setaria viridis).

• Yellow foxtail (Setaria pumila).

• Barnyard grass (Echinochloa crus-galli).

Mechanism of Action

Diclofop-methyl inhibits the enzyme acetyl-CoA carboxylase (ACCase), which is essential for fatty acid synthesis in plants. By disrupting this process, it prevents the growth and development of grass weeds, leading to their eventual death. The herbicide is absorbed through the foliage and transported throughout the plant, ensuring systemic control.

Advantages

1. Highly Effective: Provides targeted control of grass weeds in cereal crops.

2. Safe for Crops: Selective mode of action minimizes crop damage.

3. Systemic Kill: Ensures complete weed elimination, including roots.

4. Ease of Use: Compatible with standard spraying equipment.

Safety and Environmental Considerations

Handling and Storage

• Use appropriate personal protective equipment (PPE), including gloves and goggles, during handling and application.

• Store in a cool, dry location, away from food and water sources.

Environmental Impact

• Aquatic Toxicity: Harmful to aquatic organisms; avoid runoff into water bodies.

• Soil and Water Persistence: Degrades moderately in soil; follow label recommendations to minimize environmental impact.

Regulatory Compliance

• Approved for use under specific guidelines in many regions. Adhere to local regulations for application and disposal.

Limitations

• Weed Resistance: Repeated use may lead to resistance in target weed populations.

• Crop-Specific: Not suitable for use in non-cereal crops.

• Environmental Sensitivity: Requires careful application to avoid contamination of water sources.

Conclusion

Diclofop-methyl is a reliable herbicide for managing grass weeds in cereal crops. Its selective action, systemic control, and compatibility with modern agricultural practices make it a critical tool for farmers. Adhering to safety and environmental guidelines ensures its effectiveness while minimizing risks.