Master Stroke Quizalofop-Ethyl 4% + Pyrithiobac Sodium 6%
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Master Stroke Herbicide (Quizalofop-Ethyl 4% + Pyrithiobac Sodium 6% MEC)
The Ultimate "One-Shot" Solution for Broadleaf and Grassy Weeds in Cotton.
Master Stroke is a premium, broad-spectrum post-emergence herbicide designed specifically for Indian Cotton farmers. By combining two powerful active ingredients, it eliminates the need for expensive manual weeding, saving you money and protecting your "White Gold" (Cotton) during the critical growth period.
Best For: Farmers looking to replace manual labor with a cost-effective, rainfast, and high-performance chemical solution.
Why Choose This Product? Key Benefits
- ⏱️Fast Action: Weeds stop growing almost immediately. Visible yellowing starts in 3-5 days, with complete control in 2 weeks.
- ?️Dual Protection: It controls both tough broadleaf weeds (like Carpet Weed/Santha) and aggressive grassy weeds (like Barnyard Grass) in a single spray.
- ⏳Extended Control: Provides long-duration weed control, keeping your field clean during the critical 20-60 day crop stage.
- ?️Rainfast Technology: Thanks to the advanced MEC formulation, the medicine is absorbed within 2-3 hours. Sudden monsoon rains won't wash it away.
- ?Crop Safety: Highly selective formulation that kills the weeds but remains safe for Cotton plants when used as directed.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Master Stroke |
| Technical Name | Quizalofop-Ethyl 4% + Pyrithiobac Sodium 6% MEC |
| IRAC MoA Code | Group 1 (ACCase) + Group 2 (ALS) |
| Chemical Group | Aryloxyphenoxypropionate + Pyrimidinyl thiobenzoate |
| Formulation | MEC (Micro Emulsion Concentrate) |
| Toxicity Label | Blue Triangle (Moderately Toxic) |
How It Works: Mode of Action
Master Stroke uses a dual-action strategy to ensure a "Complete Kill" of weeds without harming your cotton crop.
- Pyrithiobac Sodium (Broadleaf Killer): Absorbed by roots and leaves, it stops the production of essential amino acids in broadleaf weeds, causing them to turn yellow and die.
- Quizalofop-Ethyl (Grass Killer): Specifically targets grassy weeds by inhibiting lipid (fat) synthesis, destroying the growing points and preventing regrowth.
- Synergistic Effect: The combination ensures that weeds which naturally survive single-molecule sprays are effectively controlled in one go.
The result is a clean field where your cotton crop gets 100% of the sunlight, water, and nutrients.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Cotton | Carpet Weed (Trianthema spp.) |
| Cotton | Barnyard Grass (Echinochloa spp.) |
| Cotton | Pigweeds (Amaranthus) & Digera |
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 | 400 - 450 ml | 150 - 200 Litres | 2 - 2.5 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 when weeds are at the 2 to 4 leaf stage (approx 20-25 days after sowing). Weeds larger than 5 leaves are harder to kill.
- Mixing: Use at least 150-200 liters of water per acre. Good coverage is essential for success.
- Method: Use a Knapsack sprayer with a Flat Fan or Flood Jet nozzle. Do not use low-volume power sprayers.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use. Avoid drift onto nearby Maize, Sorghum, or Pulse crops.
Frequently Asked Questions
1. How soon after spraying can it rain?
Master Stroke is rainfast within 2 to 3 hours. If it rains after this time, re-spraying is usually not required.
2. Can I use this on crops other than Cotton?
No! This product is specifically designed for Cotton. It can severely damage or kill crops like Maize, Jowar (Sorghum), or Pulses.
3. What if I have heavy black soil (Clay)?
For heavy black cotton soils or if weeds are slightly larger, use the higher dose of 450 ml per acre for effective control.
4. Can I mix it with other pesticides?
It is generally recommended to spray Master Stroke alone to maximize weed control. Mixing with insecticides may reduce efficacy or cause crop stress.
5. Why did my cotton leaves turn slightly yellow?
A temporary "Yellow Flash" (slight yellowing) is normal 3-5 days after spraying. The crop will recover fully within a week without any yield loss.
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.