Grima Herbicide: The Expert Solution for Motha (Nutsedge) Control
Stop manual weeding and eliminate Cyperus rotundus from the roots.
Grima (Halosulfuron Methyl 75% WG) by Parijat Industries is a high-precision, systemic herbicide designed specifically to tackle the toughest weed in Indian agriculture: Cyperus rotundus (commonly known as Motha). unlike ordinary contact sprays that only burn the leaves, Grima travels deep into the soil to kill the underground nuts, preventing regrowth and saving you labor costs.
Best For: Farmers growing Sugarcane and Maize facing heavy Nutsedge infestation.
Why Choose This Product? Key Benefits
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Saves Labor Costs: Replaces repeated, expensive manual weeding with a single effective spray.
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Excellent Crop Safety: Highly selective to Sugarcane and Maize; it attacks the weed enzymes, not the crop.
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Kills from the Roots: Systemic action translocates to the underground tubers ("nuts") to stop the weed from regenerating.
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Reliable Rainfastness: Requires only a 4-hour rain-free window after application to remain effective.
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Low Dosage Efficiency: A highly concentrated formulation requiring only 36g per acre, reducing transport and handling bulk.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Grima |
| Technical Name | Halosulfuron Methyl 75% WG |
| IRAC MoA Code | Group 2 (ALS Inhibitor) |
| Chemical Group | Sulfonylurea |
| Formulation | Water Dispersible Granule (WG) |
| Toxicity Label | Blue Triangle (Moderately Toxic) |
How It Works: Mode of Action
Grima operates on a "Slow Kill, Deep Kill" mechanism. It targets the Acetolactate Synthase (ALS) enzyme, which weeds need to grow.
[Image of systemic herbicide translocation in plants]- Absorption: Once sprayed, the herbicide is absorbed through the leaves and moves into the plant's vascular system.
- Translocation: It travels downwards (through the phloem) along with the plant's food supply, reaching the underground rhizomes and tubers.
- Elimination: It inhibits enzyme production in the nuts, starving the plant and preventing future sprouting. Visual yellowing appears in 3-7 days, with complete death in 14-21 days.
Note: Do not be alarmed if the weed stays green for the first few days; the chemical is working underground.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Sugarcane | Cyperus rotundus (Purple Nutsedge/Motha) |
| Maize (Corn) | Cyperus rotundus, Cyperus iria |
| Bottle Gourd | Cyperus rotundus, Cyperus iria |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" for accurate results. Grima comes in a convenient 36g pack designed for one acre.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (g / Acre) | Water (L / Acre) | Dose (g / Litre) | PHI (Days) |
|---|---|---|---|---|
| Sugarcane | 36 g | 150 L | 0.24 g | 294 |
| Maize | 36 g | 200 L | 0.18 g | 311 |
| Bottle Gourd | 36 g | 200 L | 0.18 g | 311 |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting. Note: Dosages are based on standard acre packs.
How to Apply: Best Practices
- Timing: Apply when the Motha (Nutsedge) is actively growing and is at the 2-4 leaf stage. Do not spray on old, flowering weeds.
- Mixing: Dissolve the 36g granule packet in a small bucket of water first to form a slurry. Then add this to your spray tank half-filled with water. Agitate (shake) constantly.
- Coverage: Use a Flat Fan or Flood Jet nozzle for uniform coverage. Ensure the soil has sufficient moisture (do not spray in drought conditions).
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Does Grima kill Maize or Sugarcane crops?
No. When used at the recommended dose of 36g/acre, Grima is safe. These crops have natural enzymes that break down the chemical, keeping them safe while the weed dies.
2. How long does it take to see results?
Grima is a slow-acting systemic killer. Weed growth stops immediately (within 24 hours), but visual yellowing starts in 3-7 days. Complete death of the weed and nuts takes 14-21 days.
3. What if it rains after spraying?
Grima is rainfast after 4 hours. If it rains significantly within 4 hours of application, efficacy may be reduced.
4. Can I use this on other vegetable crops?
Be careful. Only use on labeled crops (Sugarcane, Maize, Bottle Gourd). It may damage sensitive crops like sunflowers or sugar beets if planted too soon after application.
5. Why must I use a Flat Fan nozzle?
Motha has narrow, waxy leaves. A Flat Fan nozzle creates medium droplets that cover the leaf surface better than the fine mist of a Cone nozzle, ensuring the poison is absorbed.
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 spraying near water bodies or on sandy soils with high water tables.
