Weedonil Herbicide (Penoxsulam 0.97% + Butachlor 38.8% SE)
Advanced broad-spectrum weed control for healthy, high-yielding transplanted rice.
[Image of healthy transplanted rice field]Weedonil by Krishi Rasayan is a "one-shot" herbicide solution designed specifically for transplanted rice farmers. It features a powerful dual-action formula that combines two active ingredients to fight weeds in two different ways.
The Problem: Weeds like Barnyard grass and Sedges steal sunlight and nutrients from your paddy, reducing your harvest.
The Solution: Weedonil uses advanced Suspension Emulsion (SE) technology to stop weeds before they start. It provides a chemical barrier on the soil and systemic action inside the plant, ensuring your rice field stays clean during the critical first month of growth.
Why Choose This Product? Key Benefits
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Early Control Window (0-7 Days): Apply immediately after transplanting or up to 7 days later to kill weeds before they establish.
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Double-Lock Protection: Combines Penoxsulam (systemic) and Butachlor (residual) to fight resistant weeds and prevent regrowth.
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Long-Lasting Residual Action: Forms a protective layer on the soil surface that stops new weed seeds from sprouting for several weeks.
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Flexible Application Methods: Can be sprayed using a knapsack sprayer or easily mixed with sand/fertilizer and broadcasted by hand.
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Safe for Rice: Selectively targets weeds while remaining safe for your rice crop due to advanced metabolic selectivity.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Weedonil |
| Technical Name | Penoxsulam 0.97% + Butachlor 38.8% SE |
| IRAC MoA Code | Group 2 (ALS Inhibitor) + Group 15 (VLCFA Inhibitor) |
| Chemical Group | Triazolopyrimidine + Chloroacetanilide |
| Formulation | SE (Suspension Emulsion) |
| Toxicity Label | Please check bottle label (Refer to leaflet) |
How It Works: Mode of Action
Weedonil uses a synergistic "SE" technology where solid particles of Penoxsulam are suspended in a liquid emulsion of Butachlor. This creates a potent mix that attacks weeds on two fronts:
- Systemic Attack (Penoxsulam): Absorbed by leaves and roots, it travels inside the weed to block the ALS enzyme, starving the plant of essential amino acids needed for growth.
- Residual Barrier (Butachlor): Forms a chemical film on the soil/water surface. It acts on the shoots (coleoptiles) of emerging grasses, stopping cell division instantly.
- Resistance Management: By attacking two different biological sites, it effectively kills weeds that might be resistant to single-molecule herbicides.
Result: Visible yellowing of weeds within days, followed by complete death within 2-4 weeks.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Transplanted Rice |
Grasses: Barnyard Grass (Echinochloa crus-galli), Jungle Rice. |
| Transplanted Rice | Sedges: Rice Flatsedge (Cyperus iria), Smallflower Umbrella Sedge, Hoorah Grass. |
| Transplanted Rice | Broadleaf Weeds: Water Primrose (Ludwigia), False Daisy (Eclipta alba). |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" for accurate results. Applying the correct amount ensures weed control without harming the paddy.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (ml / Acre) | Water (L / Acre) | Dose (ml / Litre) | PHI (Days) |
|---|---|---|---|---|
| Transplanted Rice | 800 - 900 ml | 150 - 200 L | ~4.5 - 6 ml | Refer to Label |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
- Timing: Apply between 0 to 7 Days After Transplanting (DAT). Do not delay beyond 7 days as weed control efficiency drops.
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Mixing (Two Options):
1. Spray: Mix 800-900ml in 150L water. Spray on saturated soil, then flood the field after 24-48 hours.
2. Sand Mix: Mix the dose with 10-20kg of dry sand or fertilizer (Urea) and broadcast uniformly into standing water. - Coverage: Maintain standing water (3-5 cm depth) for 3 to 5 days after application. This water acts as a sealant to kill emerging weeds.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use. Do not use near fish ponds or aquaculture.
Frequently Asked Questions
1. What is the best time to use Weedonil?
The ideal window is 0 to 5 days after transplanting. It can be used up to 7 days, but earlier is better to stop grasses from forming hard sheaths.
2. Can I mix Weedonil with Urea/Fertilizer?
Yes, this formulation is compatible with sand or fertilizer broadcasting. Ensure there is standing water in the field when using this method.
3. Is Weedonil safe for fish in rice-fish farming?
No. The product is toxic to aquatic organisms. It should not be used in fields connected to aquaculture ponds.
4. Does it control Sedges and Broadleaf weeds?
Yes. Unlike older herbicides that only kill grasses, the Penoxsulam component in Weedonil provides excellent control of Sedges and Broadleaf weeds.
5. How long should I keep water in the field?
Maintain 3-5 cm of standing water for at least 3 to 5 days after application to ensure the herbicide forms a proper barrier on the soil.
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. Highly toxic to fish and aquatic organisms; avoid runoff into water bodies.
