Krishi Rasayan V-3 (Validamycin 3% L) Systemic Antibiotic Fungicide
The ultimate cure for Sheath Blight in Paddy.
V-3 (Validamycin 3% L) by Krishi Rasayan is a specialized systemic antibiotic fungicide designed to fight soil-borne fungal diseases. It is the industry standard for controlling Sheath Blight (Rhizoctonia solani) in rice. Unlike varied chemical fungicides, V-3 is an antibiotic derived from fermentation, making it highly effective against pathogens while remaining safe for the environment.
Best For: Farmers looking for a rainfast, curative solution that stops fungal spread immediately in high-humidity conditions.
Why Choose V-3? Key Benefits
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Rapid Curative Action: Stops the growth of fungus immediately upon contact by blocking its energy supply.
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Systemic & Translaminar: Absorbs into the leaf and moves throughout the plant system, protecting parts that were not directly sprayed.
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Rainfast Protection: The soluble liquid formulation absorbs quickly, ensuring efficacy even if it rains shortly after spraying.
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High Humidity Performance: Specifically designed to work in the wet, humid conditions where Sheath Blight thrives.
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Eco-Friendly & Safe: Safe for beneficial insects, pollinators, and earthworms. Low toxicity for mammals.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | V-3 |
| Technical Name | Validamycin 3% L |
| IRAC MoA Code | Trehalase Inhibitor (Antibiotic) |
| Chemical Group | Aminoglycoside Antibiotic |
| Formulation | Soluble Liquid (SL) |
| Toxicity Label | Blue/Green (Slightly Toxic) |
How It Works: Mode of Action
V-3 works as a "Fungistatic" agent, meaning it arrests the development of the fungus rather than just killing cells on the surface.
- Enzyme Inhibition: The active ingredient acts as a competitive inhibitor of the enzyme trehalase.
- Energy Blockade: By blocking this enzyme, it prevents the fungus from utilizing carbohydrates (sugar) for energy.
- Growth Arrest: This starvation causes the fungal hyphae to branch abnormally and stop growing, effectively drying up the infection.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Paddy (Rice) | Sheath Blight (Rhizoctonia solani) |
| Vegetables (Tomato, etc.) | Damping Off, Early Blight |
| Potato | Black Scurf, Root Rot |
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) |
|---|---|---|---|---|
| Paddy (Standard) | 400 - 600 ml | 150 - 200 L | 2.0 - 2.5 ml | 14 - 15 |
| Paddy (High Infection) | 600 - 750 ml | 200 L | 2.5 - 3.0 ml | 15 |
| Vegetables / Potato | 100 - 200 ml | Variable | 1.5 - 2.0 ml | - |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
- Timing: Apply at the first sign of disease appearance or during the maximum tillering stage (onset of disease). Repeat after 10-15 days if necessary.
- Mixing: V-3 is compatible with most insecticides. WARNING: Do not mix with Calcium Ammonium Nitrate, Bordeaux mixture, or Copper-based fungicides, as alkaline reactions destroy the antibiotic.
- Coverage: Ensure the spray reaches the lower sheaths near the waterline where the infection starts.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Is V-3 a systemic fungicide?
Yes, V-3 is a systemic antibiotic that enters the plant leaves and moves internally (translaminar action) to stop fungus growth from within.
2. Can I mix V-3 with insecticides for Paddy?
Yes, V-3 is generally compatible with common insecticides used for Stem Borer or BPH, allowing for a single tank mix application.
3. What is the best time to spray V-3?
For best results, spray preventively at the "Maximum Tillering" stage or immediately when you see the first grey-green lesions of Sheath Blight.
4. Does it affect beneficial insects?
No, V-3 is biological in origin and is considered safe for natural enemies of pests, pollinators, and soil earthworms.
5. What should I avoid mixing with V-3?
Do not mix V-3 with alkaline fertilizers (like calcium ammonium nitrate) or copper fungicides, as this will reduce its effectiveness.
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.
