Stroke Herbicide (Pyrithiobac Sodium 10% EC) – Expert Broadleaf Weed Control for Cotton
Stop weed competition instantly and protect your cotton yield with Insecticides (India) Ltd's specialized solution.
Stroke (Pyrithiobac Sodium 10% EC) is a selective, early post-emergence herbicide designed specifically for Indian cotton farmers. It targets and eliminates tough broadleaf weeds (dicots) that steal nutrients from your crop during the critical early growth stage. Unlike manual weeding, which is labor-intensive and costly, Stroke offers a chemical "rescue" solution that can be sprayed directly over standing cotton crops without harming the plants.
Best For: Controlling Trianthema (Santhi), Amaranthus (Chaulai), and other stubborn broadleaf weeds in Cotton.
Why Choose This Product? Key Benefits
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Stops Weed Growth in 24 Hours: While visual death takes time, the weeds stop competing for food and water almost immediately after spraying.
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Safe for Cotton (Selective Action): Advanced metabolic selectivity ensures your cotton plants detoxify the chemical rapidly, keeping the crop safe while killing the weeds.
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Wide Application Window: Perfect for the "Critical Period of Weed Control" (20-25 Days After Sowing), acting as a vital rescue tool when pre-emergence sprays fail.
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Excellent Rainfastness: The EC formulation absorbs quickly into leaves, making it rain-safe within just 2 to 4 hours.
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Controls Tough Weeds: Highly effective against notoriously difficult weeds like Carpet Weed (Trianthema) and Pigweed (Amaranthus).
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Stroke |
| Technical Name | Pyrithiobac Sodium 10% EC |
| IRAC MoA Code | Group 2 (ALS Inhibitor) |
| Chemical Group | Pyrimidinylthiobenzoate |
| Formulation | Emulsifiable Concentrate (EC) |
| Toxicity Label | Blue/Yellow Triangle (Moderate) |
How It Works: Mode of Action
- Systemic Absorption: The herbicide is rapidly absorbed by the weed's leaves and roots, traveling through the plant system to the active growing points.
- Enzyme Blockade: It inhibits the ALS enzyme, which is essential for synthesizing proteins (Valine, Leucine, Isoleucine).
- Starvation & Elimination: Without proteins, the weed stops growing immediately. Leaves turn yellow/purple within 3-5 days, and the weed dies completely in 14-21 days.
Note: Cotton plants have a natural enzyme system that rapidly breaks down this chemical, keeping the crop safe.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Cotton | Carpet Weed (Trianthema portulacastrum / Santhi) |
| Cotton | Pigweed (Amaranthus viridis / Chaulai) |
| Cotton | Digera arvensis (Tendla) & Chenopodium (Bathua) |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" for accurate results. Do not under-dose water volume.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (ml / Acre) | Water (L / Acre) | Dose (ml / Litre) | PHI (Days) |
|---|---|---|---|---|
| Cotton (Normal Soil) | 250 ml | 200 Litres | 1.25 ml | 160 |
| Cotton (Heavy Clay Soil) | 300 ml | 200 Litres | 1.5 ml | 160 |
| Spray Pump (15L Tank) | -- | -- | 25 - 30 ml / Tank | -- |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
- Timing: Spray when weeds are at the 2 to 4 leaf stage (approx 20-25 days after sowing). Weeds larger than 4 leaves are harder to kill.
- Mixing: Use a Flat Fan Nozzle or Flood Jet nozzle for proper coverage. Do NOT use Hollow Cone nozzles (insecticide nozzles).
- Coverage: Ensure there is adequate soil moisture (Wapsa condition) before spraying. Do not spray on wilted weeds.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Can I mix Stroke with other insecticides?
Strictly Avoid mixing with Organophosphates (e.g., Monocrotophos, Acephate). This causes severe damage to cotton. Maintain a gap of 5-7 days between Stroke and these insecticides.
2. Does Stroke kill grassy weeds?
No. Stroke is specific to broadleaf weeds (dicots). It will not kill grasses like Barnyard grass. For mixed weeds, you may need a separate application of a grass-killer.
3. My cotton leaves turned slightly yellow after spraying. Is this normal?
Yes, this is called "Yellow Flash." It is a temporary cosmetic effect that happens when the plant detoxifies the chemical. The crop typically recovers its green color within 7-10 days with no yield loss.
4. What is the correct water volume?
Do not cut corners on water. Use 200 Litres per acre (approx 13 tanks). Using less water concentrates the chemical too much and reduces coverage.
5. Can I use this on crops other than Cotton?
No. Stroke is strictly recommended for Cotton. Using it on other crops may result in total crop failure as they lack the specific safety enzymes found in cotton.
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. Avoid drift to neighboring non-cotton crops.
