Clavengo Herbicide (Syngenta) – Glufosinate Ammonium 13.5% SL
The Ultimate Solution for Hard-to-Kill Weeds in Cotton and Tea
Syngenta Clavengo is a powerful broad-spectrum contact herbicide designed to tackle tough weeds that other chemicals miss. Powered by Glufosinate Ammonium (13.5%), it serves as the perfect middle ground between slow-acting systemics and highly toxic contact sprays.
Best For: Farmers dealing with labor shortages, Glyphosate-resistant weeds, and tough species like Parthenium (Carrot Grass).
Why Choose This Product? Key Benefits
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Rapid Action: Weed growth stops within hours. Visual yellowing appears in 2-3 days, with complete death in 7-10 days.
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Resistance Breaker: Effectively controls weeds that have developed resistance to Glyphosate. It is also safer for the operator compared to Paraquat.
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No Soil Carryover: Degrades rapidly in the soil (3–10 days half-life). It will not harm your next crop or fruit tree roots.
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Rainfast in 4 Hours: The advanced surfactant system ensures the chemical sticks. If it rains 4 hours after spraying, you do not need to respray.
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Complete Broad-Spectrum: Kills broadleaf weeds (like Parthenium), grasses (Jungle Rice), and burns down sedges (Nutgrass) effectively.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Clavengo (Syngenta) |
| Technical Name | Glufosinate Ammonium 13.5% SL |
| IRAC MoA Code | Group 10 (Glutamine Synthetase Inhibitor) |
| Chemical Group | Phosphinic Acid |
| Formulation | Soluble Liquid (SL) |
| Toxicity Label | Blue Triangle (Moderately Toxic) |
How It Works: Mode of Action
Clavengo works differently than Glyphosate. It is a Contact Herbicide with limited movement inside the plant.
- Enzyme Inhibition: It blocks the enzyme Glutamine Synthetase, which is vital for nitrogen metabolism.
- Ammonia Trap: This blockage causes toxic ammonia to build up rapidly inside the plant cells.
- Energy Collapse: The ammonia destroys cell membranes and stops photosynthesis, causing the weed to dry out and die.
Note: Since it is a contact killer, excellent coverage is required. You must drench the entire weed.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Cotton | Echinochloa spp, Dactyloctenium sp (Grasses), Parthenium (Carrot Grass), Trianthema (Horse Purslane). |
| Tea | Borreria, Imperata cylindrica, Digitaria, and various broadleaf weeds & ferns. |
| Non-Crop Areas | Excellent for clearing Parthenium and general jungle weeds. |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" for accurate results.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (ml / Acre) | Water (L / Acre) | Dose (ml / Litre) | PHI (Days) |
|---|---|---|---|---|
| Cotton | 1000 – 1320 ml | 200 Litres | 5 – 6.6 ml | 30 Days |
| Tea | 1000 – 1320 ml | 200 Litres | 5 – 6.6 ml | 30 Days |
| Vegetables (Pre-plant) | 1000 ml | 200 Litres | 5 ml | 7-10 Days (Before planting) |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
- Timing: Spray on bright, sunny days when weeds are actively growing. Do not spray in the evening or on cloudy days for best results.
- Mixing: Use clean water. Avoid muddy water.
- Coverage: Use Flat Fan or Flood Jet Nozzles. Do NOT use Hollow Cone nozzles. Use a Hood/Shield in Cotton to prevent drift onto the crop leaves.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Is Clavengo Systemic or Contact?
It is primarily a contact herbicide. It kills the parts of the plant it touches. It does not travel down to the roots like Glyphosate, so thorough coverage (drenching) is necessary.
2. Does it kill Nutgrass (Motha/Cyperus)?
It provides excellent "burn-down" of the green leaves, stopping the weed's growth. However, since it doesn't move deep into the roots, the underground tubers may survive.
3. Can I use it on standing Cotton crops?
Yes, but ONLY with a protective hood (shield) on your spray nozzle. If the spray touches the cotton leaves or green stem, it will burn them.
4. Why is the water volume (200L/Acre) so high?
Because Clavengo is a contact killer, every leaf needs to be wet for the weed to die. Using less water (like 100L) will result in poor control and wasted money.
5. Is it cheaper than manual weeding?
Yes. Chemical weeding with Clavengo costs approximately ₹1,300–₹1,500 per acre, whereas manual weeding can cost ₹2,000–₹3,500 per acre.
Safety & Disclaimer
Always read and follow the instructions on the official product label. The information provided here is for guidance only. Use personal protective equipment (PPE) during application.
