Fenoxaprop-P-ethyl

Fenoxaprop-P-ethyl is a highly effective post-emergence herbicide widely used in agriculture for controlling grassy weeds in various crops. This selective herbicide offers excellent control over a broad spectrum of annual and perennial grasses while maintaining crop safety when used as directed.

Product Specifications

• Chemical Name: Ethyl (R)-2-[4-(6-chloro-2-benzoxazolyloxy)phenoxy]propanoate
• Molecular Formula: C₁₈H₁₆ClNO₅
• CAS Number: 66441-23-4
• Appearance: Colorless to light brown viscous liquid
• Solubility: 0.9 mg/L in water at 20°C
• Vapor Pressure: 3.3 x 10^-5 mPa at 20°C
• Melting Point: 85-87°C

Technical Parameters

FAQ about Fenoxaprop-P-ethyl

1. What crops can Fenoxaprop-P-ethyl be used on?

Fenoxaprop-P-ethyl is primarily used in wheat, barley, rye, triticale, and certain broadleaf crops. It's also registered for use in soybeans, peanuts, and sunflower in some regions. Always check local regulations and crop-specific guidelines before application.

2. How does Fenoxaprop-P-ethyl work as a herbicide?

Fenoxaprop-P-ethyl inhibits acetyl-CoA carboxylase (ACCase), an enzyme essential for fatty acid synthesis in grasses. This disruption prevents the formation of cell membranes, ultimately leading to weed death. The "P" designation indicates it's the more biologically active enantiomer, providing superior efficacy at lower doses.

3. What is the optimal application timing for Fenoxaprop-P-ethyl?

The optimal timing is when grassy weeds are at the 2-5 leaf stage. Early applications may miss later germinating weeds, while late applications may reduce efficacy. For perennial grasses, applications should be made when plants are actively growing and have sufficient leaf area.

Application Guidelines

For best results with Fenoxaprop-P-ethyl:

• Apply when weeds are actively growing
• Use recommended adjuvants for improved absorption
• Avoid applications under drought stress conditions
• Maintain proper spray volume (typically 100-200 L/ha)
• Follow local resistance management strategies

Safety Information

When handling Fenoxaprop-P-ethyl:

• Wear protective clothing, gloves, and eye protection
• Avoid contact with skin and eyes
• Do not eat, drink, or smoke during application
• Wash hands thoroughly after handling
• Store in original containers away from food and feed

Environmental Considerations

Fenoxaprop-P-ethyl has these environmental characteristics:

• Moderately persistent in soil (DT50 1-3 weeks)
• Low potential for groundwater contamination
• Moderately toxic to aquatic organisms
• Low volatility
• Degrades rapidly in water through hydrolysis

Fenoxaprop-P-ethyl FAQ Continued

4. Can Fenoxaprop-P-ethyl be tank-mixed with other herbicides?

Yes, Fenoxaprop-P-ethyl is commonly tank-mixed with broadleaf herbicides like 2,4-D, MCPA, or dicamba for broader spectrum control. However, always conduct a jar test first and follow label recommendations, as some combinations may require specific adjuvants or have application restrictions.

5. What is the rainfast period for Fenoxaprop-P-ethyl?

Fenoxaprop-P-ethyl typically requires 4-6 hours to be fully absorbed by weeds. Rainfall occurring within this period may reduce efficacy. The exact rainfast period depends on formulation, adjuvants used, and environmental conditions.

6. How should I store Fenoxaprop-P-ethyl products?

Store Fenoxaprop-P-ethyl in its original container in a cool, dry, well-ventilated area away from direct sunlight. Keep away from food, feed, and seeds. The ideal storage temperature is between 0°C and 35°C. Keep containers tightly closed when not in use.

Resistance Management

To prevent resistance development to Fenoxaprop-P-ethyl:

• Rotate with herbicides having different modes of action
• Use integrated weed management strategies
• Apply at recommended rates
• Control weeds when they are small
• Monitor fields for reduced efficacy

Comparative Advantages

Fenoxaprop-P-ethyl offers several advantages:

• Highly selective grass control in broadleaf crops
• Low use rates compared to older herbicides
• Flexible application timing (post-emergence)
• Good crop safety profile when used properly
• Compatible with many tank-mix partners

Fenoxaprop-P-ethyl FAQ Final Section

7. What is the difference between Fenoxaprop-ethyl and Fenoxaprop-P-ethyl?

Fenoxaprop-P-ethyl is the purified, biologically active enantiomer of Fenoxaprop-ethyl, containing only the (R)-enantiomer. This provides improved herbicidal activity at lower application rates compared to the racemic mixture (Fenoxaprop-ethyl) which contains both active and less active forms.

8. Can Fenoxaprop-P-ethyl be used in organic farming?

No, Fenoxaprop-P-ethyl is a synthetic chemical herbicide and is not approved for use in organic farming systems certified under organic production standards.

9. What are the symptoms of Fenoxaprop-P-ethyl phytotoxicity in target weeds?

Treated grasses show symptoms within 3-7 days, including chlorosis (yellowing), necrosis (tissue death), stunting, and eventual plant death. The growing points are particularly affected, leading to collapse of the central shoot in susceptible species.