Kri-Weed Herbicide (Bispyribac Sodium 10% SC) by Krishi Rasayan
The Ultimate Post-Emergence Solution for Weed-Free Rice Fields
Kri-Weed is a powerful, broad-spectrum herbicide designed specifically for paddy farmers. Manufactured by Krishi Rasayan, it effectively eliminates tough grasses, sedges, and broadleaf weeds in nurseries, transplanted rice, and Direct Seeded Rice (DSR).
Stop worrying about labor costs and manual weeding—protect your yield with the trusted chemistry of Bispyribac Sodium.
Why Choose Kri-Weed? Key Benefits
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Wide Application Window: Works effectively when weeds are at the 2-leaf to 5-leaf stage.
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Crop Safety: Highly selective formulation that kills weeds but allows rice plants to recover fully.
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Cost Effective: Saves over 90% of costs compared to manual weeding labor.
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Rain Fastness: The superior SC formulation sticks to leaves better and resists washing off.
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Broad Spectrum Control: Kills major enemies like Barnyard Grass (Echinochloa), Sedges, and Water Primrose.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Kri-Weed |
| Technical Name | Bispyribac Sodium 10% SC |
| IRAC MoA Code | Group 2 (ALS Inhibitor) |
| Chemical Group | Pyrimidinylthiobenzoate |
| Formulation | Suspension Concentrate (SC) |
| Toxicity Label | Blue Triangle (Caution) |
How It Works: Mode of Action
Kri-Weed acts systemically, moving through the plant's system to stop growth from the inside out.
- Absorption: The herbicide is absorbed by the leaves and roots of the weeds.
- Enzyme Blockage: It inhibits the ALS enzyme, which stops the production of essential amino acids (Valine, Leucine, Isoleucine).
- Elimination: The weed stops growing almost immediately. Leaves turn yellow (chlorosis), then brown (necrosis), and the weed dies within 14-21 days.
Note: Rice plants contain a special enzyme that breaks down the chemical quickly, keeping the crop safe.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Rice (Nursery) | Barnyard Grass (Echinochloa), Jungle Rice |
| Transplanted Rice | Wrinkle Grass, Smallflower Umbrella Sedge, Water Primrose |
| Direct Seeded Rice (DSR) | Globe Fringerush, False Daisy, Barnyard Grass |
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) |
|---|---|---|---|---|
| Rice Nursery | 80 - 120 ml | 120 - 150 L | 0.8 - 1.0 ml | As per Label |
| Transplanted Rice | 80 - 120 ml | 120 - 150 L | 0.8 - 1.0 ml | As per Label |
| Direct Seeded Rice | 80 - 120 ml | 120 - 150 L | 0.8 - 1.0 ml | As per Label |
*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 2-5 leaf stage (usually 10-15 days after planting for transplanted rice).
- Mixing: Drain the field water before spraying to expose the weeds.
- Coverage: Use a Flat Fan or Flood Jet nozzle for uniform coverage. Re-flood the field 2-3 days after spraying and maintain water for 10 days.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Does Kri-Weed hurt the rice crop?
Some temporary yellowing (Yellow Flash) may occur, but the crop recovers fully in 4-7 days without yield loss.
2. Can I mix Kri-Weed with insecticides?
It is generally not recommended to mix. Do not mix with Flubendiamide as it reduces weed control efficacy.
3. What happens if it rains after spraying?
Kri-Weed is rainfast after 6 hours. The SC formulation helps it stick to the leaves quickly.
4. Does it affect the next crop?
No. Kri-Weed degrades rapidly in the soil (10-13 days) and is safe for succeeding crops like pulses or mustard.
5. Why must I drain the water before spraying?
The herbicide needs to touch the weed leaves. If the weeds are underwater, the chemical cannot reach them to kill them.
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.
