Thor (Pretilachlor 50% EC) Herbicide
Your Powerful Pre-Emergence Solution for Weed-Free Rice
Thor (Pretilachlor 50% EC) is a selective, pre-emergence herbicide from Parijat Industries, expertly formulated for transplanted rice. It provides outstanding, broad-spectrum control over the most challenging annual grasses, sedges, and broad-leaved weeds, ensuring your paddy crop gets a healthy, competition-free start.
A single, early application stops weeds before they can even germinate.
Why Choose This Product? Key Benefits
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Fast Pre-Emergence Action: Apply 0-4 days after transplanting to stop weeds before they even start, saving you time and labor.
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Excellent Crop Safety: Highly selective to transplanted rice. It has no phytotoxic effect on any rice variety when used as recommended.
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Long-Duration Control: Forms a protective layer in the soil, delivering residual control that keeps new flushes of weeds from emerging.
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Flexible Application: Can be applied effectively as a conventional spray or broadcasted as a sand mix, making it adaptable to your needs.
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Broad-Spectrum Control: One solution for "almost all" major paddy weeds, including tough grasses (*Echinochloa*), sedges (*Cyperus*), and broad-leaved weeds.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Thor |
| Technical Name | Pretilachlor 50% EC |
| IRAC MoA Code | Group 15 (VLCFA Inhibition) |
| Chemical Group | Chloroacetamide |
| Formulation | Emulsifiable Concentrate (EC) |
| Toxicity Label | Green Triangle (Low acute mammalian toxicity) |
How It Works: Mode of Action
Thor is a selective, systemic herbicide that works by disrupting cell division in germinating weeds.
- Application: Thor is applied as a spray or sand mix into the paddy water (2-3 cm deep) just after transplanting.
- Absorption: It forms a chemical barrier on the soil surface. As weed seeds germinate, they absorb the herbicide primarily through their shoots (coleoptiles) and secondarily through their roots.
- Inhibition: As a Chloroacetamide, Thor inhibits the synthesis of very-long-chain fatty acids (VLCFAs). This process is essential for forming new cell membranes, and by stopping it, Thor halts all new cell division and growth.
The weeds die before or just as they emerge from the soil, never getting the chance to compete with the rice crop.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Transplanted Rice | Annual Grasses: *Echinochloa crusgalli* (Barnyard Grass), *Echinochloa colonum* (Jungle Rice), *Leptochloa chinensis*. |
| Transplanted Rice | Sedges: *Cyperus difformis* (Small-flower Umbrella Sedge), *Cyperus iria* (Rice Flatsedge), *Fimbristylis miliacea*. |
| Transplanted Rice | Broad-Leaved Weeds: *Eclipta alba* (False Daisy), *Ludwigia parviflora*, *Monochoria vaginalis* (Pickerel Weed). |
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) |
|---|---|---|---|---|
| Transplanted Rice | 500 ml | 150 - 300 L | ~2.5 - 3.3 ml | |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting. Always refer to the product label for the specific PHI.
How to Apply: Best Practices
- Timing: Apply only during the pre-emergence window: 0 to 4 Days After Transplanting (DAT).
- Mixing: (Spray) Add 500 ml of Thor to 150-300 L of water per acre. (Sand Mix) Alternatively, mix 500 ml of Thor thoroughly with 20-25 kg of dry sand and broadcast it evenly across the acre.
- Coverage: Ensure the field has 2-3 cm of standing water. Use a Flat Fan or Flood Jet nozzle for a uniform spray. Maintain the 2-3 cm water level for at least 5 days *after* application.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. When is the best time to apply Thor?
The critical application window is 0 to 4 days after transplanting the rice seedlings. It must be applied *before* the weeds emerge.
2. What is the correct water level for application?
The field must have a uniform standing water level of 2-3 cm at the time of application. This water level must be maintained for at least 5 days *after* application for the herbicide to work effectively.
3. Can I use Thor on Direct-Seeded Rice (DSR)?
This formulation (50% EC) is specifically labeled for *Transplanted Rice*. Applying it to Direct-Seeded Rice may cause severe injury (phytotoxicity) to the emerging rice seeds.
4. Can I mix Thor with other pesticides?
Yes, Thor has good compatibility. Field studies confirm it can be safely tank-mixed with common insecticides (like Monocrotophos) and fungicides (like Carbendazim) without harming the crop.
5. Will Thor harm my next crop (e.g., wheat or pulses)?
No. When used as recommended, Thor is moderately persistent for the rice season but does not have a harmful residual effect that will carry over to subsequent or follow-on crops.
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. Ecotoxicity Warning: The active ingredient is classified as H410: "Very toxic to aquatic life with long lasting effects." Do not contaminate ponds, waterways, or ditches. Avoid releasing treated paddy water into natural water bodies to prevent harm to fish and other aquatic organisms.
