Pretilachlor

Pure product is colorless liquid. b.p. 135℃ /0.1Pa, relative density

1.076(20℃ ), vapor pressure 0.133×10-3Pa. soluble in most organic

solvents, solubility in water 50mg/L at 20℃ , part ition coeffi cient

(n-octanol/water) 12020. stable at room temperature for 2 years.

hydrolysis half-life 200d(pH=1~9) at 20℃ , 14d(pH=13), half-life in soil

20~50d. ), 14d(pH=13), half-life in soil 20-50d.

It can prevent and control weeds such as sedge, cattle felt, duckweed and knapweed in rice fields

Pretilachlor is a selective pre-emergent herbicide widely used in rice cultivation to control annual grasses, sedges, and broadleaf weeds. It is highly effective in ensuring a clean field environment during the critical early growth stages of rice, helping farmers achieve higher yields. Pretilachlor belongs to the chloroacetamide family and is particularly valued for its compatibility with direct-seeded and transplanted rice systems.

Key Features

1. Selective Action: Targets weeds without harming rice crops.

2. Pre-Emergent Control: Prevents weed germination and growth.

3. Soil-Applied: Works effectively through soil incorporation.

4. Wide Weed Spectrum: Controls grasses, sedges, and some broadleaf weeds.

Applications

Crops Treated

• Rice (Direct-Seeded and Transplanted)

Weeds Controlled

• Barnyard grass (Echinochloa crus-galli)

• Smallflower umbrella sedge (Cyperus difformis)

• Purple nutsedge (Cyperus rotundus)

• Pigweed (Amaranthus spp.)

• Goosegrass (Eleusine indica)

Mechanism of Action

Pretilachlor inhibits the biosynthesis of very-long-chain fatty acids (VLCFAs) in weed seedlings. This disrupts cell division and growth, effectively killing weeds before they emerge. Applied to the soil, it forms a protective layer that prevents weed germination and development.

Advantages

1. Effective Weed Control: Reduces weed pressure during the critical early growth stages of rice.

2. Crop Safety: Highly selective for rice crops, ensuring no harm to the plants.

3. Long-Lasting Effect: Provides extended weed control with a single application.

4. Ease of Use: Suitable for both wet and dry soil conditions.

Safety and Environmental Considerations

Handling and Storage

• Use appropriate personal protective equipment (PPE) such as gloves, masks, and goggles during application.

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

Environmental Impact

• Aquatic Safety: Avoid application near water bodies to prevent contamination.

• Soil Stability: Pretilachlor degrades over time, minimizing long-term environmental impact.

• Non-Target Safety: Minimal impact on beneficial organisms when used as directed.

Regulatory Compliance

• Always follow local guidelines and application rates to ensure safe and effective use.

Limitations

• Resistance Risk: Repeated use may lead to the development of resistant weed populations.

• Weather Dependency: Requires adequate soil moisture for activation.

• Post-Emergent Ineffectiveness: Does not control weeds that have already emerged.

Conclusion

Pretilachlor is a trusted herbicide for rice farmers, providing reliable pre-emergent control of weeds and promoting healthy crop growth. Its selective action, broad weed spectrum, and ease of use make it an essential tool for modern rice cultivation. Adhering to recommended application practices ensures effective weed management and minimizes environmental risks.