Bispyribac-sodium

Pure product is white powder solid, m.p. 223-224℃ , vapor

pressure <5.05×10-9Pa (25℃ ), solubility at 25℃ : methanol 26.3g/

L, acetone 0.043g/L, water 73.3g/L, half-life in water is 1 year (pH

7-9), hot storage at 55℃ for 14d without decomposition, pKa3.05.

used to control grass weeds such as barnyard grass and broadleaf weeds in paddy field. It can be used in seedling field, direct seeding field, small seedling transplanting fi eld and seedling throwing field

Bispyribac-Sodium is a selective, systemic herbicide belonging to the pyrimidinyl oxybenzoic acid family. It is widely used in rice cultivation to control a broad spectrum of annual and perennial grasses, sedges, and broadleaf weeds. Known for its post-emergent activity, Bispyribac-Sodium offers precise weed control with minimal crop impact.

Key Features

1. Selective Herbicide: Designed specifically for use in rice fields.

2. Systemic Action: Absorbed by leaves and roots, translocating throughout the plant.

3. Broad-Spectrum Control: Effective against grasses, sedges, and broadleaf weeds.

4. Low Application Rates: Requires minimal dosages for effective weed management.

Applications

Crops Treated

• Rice (Paddy Fields)

Weeds Controlled

• Grasses:

  • Barnyard Grass (Echinochloa crus-galli)

  • Goosegrass (Eleusine indica)

  
  

• Sedges:

  • Purple Nutsedge (Cyperus rotundus)

  • Yellow Nutsedge (Cyperus esculentus)

  
  

• Broadleaf Weeds:

  • Ludwigia (Ludwigia spp.)

  • Spiny Amaranth (Amaranthus spinosus)

  
  

Mechanism of Action

Bispyribac-Sodium inhibits acetolactate synthase (ALS), an enzyme critical for the synthesis of branched-chain amino acids in plants. This disruption halts protein synthesis, causing stunted growth and eventual weed death, while rice plants remain unaffected due to their inherent tolerance.

Advantages

1. Precise Weed Control: Targets weeds without harming rice crops.

2. Flexibility: Can be used at various growth stages of both crops and weeds.

3. Environmentally Friendly: Requires low application rates, reducing environmental impact.

4. Improves Yield: Reduces weed competition, allowing rice plants to thrive.

Safety and Environmental Considerations

Handling and Storage

• Use personal protective equipment (PPE) during handling and application.

• Store in a dry, well-ventilated area, away from food and water sources.

Environmental Impact

• Aquatic Safety: Avoid runoff into water bodies to protect aquatic ecosystems.

• Soil Persistence: Degrades relatively quickly under aerobic conditions, minimizing residue buildup.

Regulatory Compliance

• Adhere to local guidelines and product label instructions for safe application.

Limitations

1. Resistance Development: Overuse may lead to ALS-resistant weed populations.

2. Narrow Crop Range: Primarily used for rice; not suitable for other crops.

3. Timing Sensitivity: Most effective on young, actively growing weeds.

Conclusion

Bispyribac-Sodium is a reliable herbicide for rice cultivation, offering targeted control of weeds while maintaining crop safety. Its systemic action, low application rates, and broad-spectrum efficacy make it an essential tool for farmers. To ensure long-term effectiveness, it should be used as part of an integrated weed management program with proper application practices.