Clodinafop-propargyl
Clodinafop-propargyl is a highly effective post-emergence herbicide widely used for controlling grass weeds in wheat and other cereal crops. As a selective aryloxyphenoxypropionate herbicide, Clodinafop-propargyl offers superior weed control while ensuring crop safety.
Technical Specifications
- Chemical Name: (R)-2-[4-(5-chloro-3-fluoropyridin-2-yloxy)phenoxy]propionic acid propargyl ester
- Molecular Formula: C17H13ClFNO4
- Molecular Weight: 349.74 g/mol
- Appearance: Colorless to light yellow viscous liquid
- Solubility: Soluble in most organic solvents; slightly soluble in water
- Melting Point: 48-49°C
- Stability: Stable under normal temperatures and pressures
| Parameter | Value |
|---|---|
| Active Ingredient Content | ≥ 95% |
| Moisture Content | ≤ 0.5% |
| pH Range | 5.0-7.0 |
| Storage Temperature | 0-30°C |
| Shelf Life | 2 years in original packaging |
Application Guidelines
Clodinafop-propargyl should be applied at the 2-5 leaf stage of weed growth for optimal effectiveness. Recommended application rates vary depending on weed species and growth stage:
| Target Weed | Application Rate (g ai/ha) | Water Volume (L/ha) |
|---|---|---|
| Wild oat (Avena fatua) | 60-80 | 200-300 |
| Blackgrass (Alopecurus myosuroides) | 50-70 | 200-300 |
| Ryegrass (Lolium spp.) | 50-60 | 200-300 |
Clodinafop-propargyl FAQ
What is the mechanism of action of Clodinafop-propargyl?
Clodinafop-propargyl inhibits acetyl-CoA carboxylase (ACCase), a key enzyme in lipid biosynthesis. This disruption prevents the formation of fatty acids, which are essential for plant cell membrane production. The herbicide is absorbed through leaves and translocated to growing points, causing growth inhibition and eventual death of susceptible grass weeds.
What is the rainfast period for Clodinafop-propargyl?
Clodinafop-propargyl requires at least 6 hours of dry weather after application for optimal absorption. If rain occurs within this period, some efficacy may be reduced, and a second application may be necessary. The herbicide becomes rainfast more quickly under warm, sunny conditions compared to cool, cloudy weather.
Can Clodinafop-propargyl be tank-mixed with other herbicides?
Yes, Clodinafop-propargyl can be tank-mixed with certain broadleaf herbicides like 2,4-D or MCPA to provide complete weed control in cereal crops. However, compatibility should always be tested in a small jar first, and adjuvants may be required to maintain stability. Avoid mixing with sulfonylurea herbicides as this may reduce efficacy.
Safety Precautions
- Wear protective clothing, gloves, and eye protection during handling
- Avoid contact with skin and eyes
- Do not eat, drink or smoke while handling the product
- Wash hands thoroughly after use
- Store in original container away from food and feed
- Dispose of empty containers according to local regulations
Environmental Considerations
Clodinafop-propargyl has low toxicity to mammals but can be harmful to aquatic organisms. Application should avoid direct contamination of water bodies. The herbicide degrades relatively quickly in soil (DT50 7-14 days) through microbial activity, minimizing long-term environmental impact.
More Clodinafop-propargyl FAQ
What is the optimal temperature range for applying Clodinafop-propargyl?
The ideal temperature range for Clodinafop-propargyl application is between 10°C and 25°C. Application below 8°C may reduce efficacy as weed growth slows, while temperatures above 30°C may increase crop stress. Early morning or late afternoon applications are often recommended to avoid high temperature extremes.
How quickly does Clodinafop-propargyl show visible effects on weeds?
Visible symptoms (leaf yellowing and growth cessation) typically appear within 5-10 days after application under optimal conditions. Complete weed death usually occurs within 2-3 weeks. The speed of action depends on environmental conditions, with faster results under warm, moist growing conditions compared to cool, dry conditions.
Factors Affecting Efficacy
| Factor | Optimal Conditions | Effect on Performance |
|---|---|---|
| Weed Growth Stage | 2-5 leaf stage | Younger weeds more susceptible |
| Weather Conditions | Sunny, moderate temperatures | Enhanced translocation |
| Soil Moisture | Adequate soil moisture | Promotes active weed growth |
| Adjuvant Use | Recommended adjuvant | Improves absorption |
Additional Clodinafop-propargyl FAQ
What is the rotational crop restriction after using Clodinafop-propargyl?
Following Clodinafop-propargyl application, wait at least 4 months before planting non-cereal crops. For sensitive crops like canola or legumes, a longer rotation interval of 6-12 months is recommended. Always consult local guidelines as restrictions may vary based on soil type and climatic conditions.
How does Clodinafop-propargyl compare to other grass herbicides?
Clodinafop-propargyl offers several advantages including excellent activity against resistant grass weeds, good crop safety in wheat, and relatively short soil residual activity. Compared to older ACCase inhibitors, it typically requires lower application rates while maintaining broad-spectrum control of annual grassy weeds.