Master Stroke Herbicide (Quizalofop-Ethyl 4% + Pyrithiobac Sodium 6% MEC)
The Ultimate "Double Engine" Post-Emergence Herbicide for Cotton.
Master Stroke is a specialized, broad-spectrum herbicide designed specifically for Indian Cotton farmers. It solves the biggest headache in cotton farming: managing both grassy and broadleaf weeds simultaneously without relying on expensive manual labor.
The MEC Advantage: Unlike older chemical formulas, Master Stroke uses Micro Emulsion Concentrate (MEC) technology. This creates nano-sized particles that penetrate weed leaves faster and deeper, ensuring a complete kill even on tough weeds.
Why Choose This Product? Key Benefits
-
⏱️
Rainfast in 2-3 Hours: The advanced MEC formula absorbs quickly. If it rains 3 hours after spraying, you do not need to respray.
-
🛡️
Dual Action Power: A single spray kills aggressive broadleaf weeds (like Carpet Weed/Santha) and tough grasses (like Barnyard Grass).
-
⏳
Huge Cost Savings: Using Master Stroke costs nearly 60% less than hiring manual labor for weeding.
-
🌧️
Deep Penetration: The nano-particles penetrate waxy and hairy leaf surfaces where other herbicides fail.
-
🌿
Crop Safety: Scientifically designed to be metabolized by the Cotton plant, ensuring the weed dies while the crop stays safe.
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 (Class III - Slightly Hazardous) |
How It Works: Mode of Action
Master Stroke uses a synergistic "Two-Pronged Attack" to ensure no weed escapes.
- Quizalofop-Ethyl (The Grass Specialist): Targets the ACCase enzyme in grassy weeds. It stops lipid synthesis, destroying the plant's ability to build cell membranes. This causes "basal rot"—the weed rots from the base up.
- Pyrithiobac Sodium (The Broadleaf Specialist): Absorbed by both leaves and roots, it blocks the ALS enzyme. This immediately stops cell division in broadleaf weeds like Carpet Weed.
- Systemic Control: The chemical travels through the phloem to the roots, ensuring the weed is killed completely and does not regrow.
Note: Cotton plants have a natural enzyme system that rapidly detoxifies Pyrithiobac, keeping the crop healthy.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Cotton | Carpet Weed / Itshit / Santha (Trianthema portulacastrum) |
| Cotton | Barnyard Grass (Echinochloa spp.) |
| Cotton | Pigweeds (Amaranthus spp.) & Digera |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" and maintain high water volume for accurate results.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (ml / Acre) | Water (L / Acre) | Dose (ml / Litre) | PHI (Days) |
|---|---|---|---|---|
| Cotton (Light Soils) | 400 ml | 150 - 200 L | 2.0 - 2.5 ml | Refer Label |
| Cotton (Heavy/Black Soils) | 450 ml | 150 - 200 L | 2.5 - 3.0 ml | Refer Label |
*Heavy soils (Clay) require a higher dose because clay absorbs some of the chemical.
How to Apply: Best Practices
- Timing: Apply when weeds are young (2 to 4 leaf stage), typically 20-25 days after sowing. Avoid spraying on weeds with more than 5 leaves.
- Moisture: The soil must have adequate moisture (field capacity) at the time of spraying for the chemical to work effectively.
- Coverage: Use Flat Fan or Flood Jet nozzles. Ensure the spray covers the weeds completely.
- Safety: Always wear PPE (gloves, mask, goggles). Do not spray if the crop is under stress (drought or pest attack).
Frequently Asked Questions
1. Does Master Stroke kill Purple Nutsedge (Motha)?
It is primarily a Broadleaf and Grass killer. It will suppress Nutsedge (yellowing and stunting) but may not kill it completely.
2. My cotton turned yellow after spraying. Is it damaged?
This is a common "Yellow Flash." It is temporary. The crop will recover its green color within 7-14 days without any loss in yield.
3. Can I use this on Maize or Jowar?
NO. Master Stroke will kill Maize, Sorghum (Jowar), and most other crops. It is strictly for Cotton only.
4. What if it rains after I spray?
The product is rainfast within 2 to 3 hours. If it rains after 3 hours, the product has already been absorbed.
5. Should I mix it with insecticides?
It is generally not recommended to tank mix with other pesticides to avoid crop shock. Apply Master Stroke alone for the best results.
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 spray drift onto neighboring non-cotton crops.
