Stunner-Cyazofamid 34.5% SC
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Stunner Fungicide (Cyazofamid 34.5% SC) by IIL | Expert Control for Downy Mildew & Late Blight
Secure your Grapes, Potatoes, and Tomatoes with India's indigenous answer to Oomycete diseases.
Stunner Fungicide is a breakthrough solution from Insecticides (India) Limited, bringing the power of the molecule Cyazofamid to Indian farmers. Unlike older generic sprays, Stunner is a specialized "Make in India" product designed specifically to fight "water molds" like Downy Mildew and Late Blight.
Why it stands out: Stunner breaks the resistance cycle. If your crop is no longer responding to standard fungicides, Stunner's unique chemistry steps in to stop the disease immediately. It is safe for export crops (especially grapes bound for the EU) and provides long-lasting protection even during the monsoon season.
Why Choose This Product? Key Benefits
- ⏱️Rapid Rainfastness: Sticks to the leaf within 1 to 4 hours. No need to re-spray if it rains shortly after application, saving you money and labor.
- ?️Resistance Breaker: Works effectively on fungal strains that have become resistant to older chemicals like Strobilurins or Phenylamides.
- ⏳Long-Lasting Protection: Provides a solid defense shield for 7 to 10 days, effectively reducing the total number of sprays required per season.
- ?️Translaminar Action: Penetrates the leaf surface to kill hidden fungus on the underside of the leaves, ensuring complete coverage.
- ?Export & Bee Safe: Meets strict EU residue limits (MRLs) for grapes and is non-toxic to honeybees, making it safe for pollination periods.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Stunner |
| Technical Name | Cyazofamid 34.5% SC |
| IRAC MoA Code | Group 21 (QiI Fungicide) |
| Chemical Group | Cyanoimidazole |
| Formulation | Suspension Concentrate (SC) |
| Toxicity Label | Blue Triangle (Moderately Toxic) |
How It Works: Mode of Action
Stunner operates differently from standard fungicides. It targets the mitochondria (the power plant) of the fungal cell to shut down energy production.
- Energy Blockade: Stunner inhibits the Qi site of Complex III in the mitochondria. This instantly stops the fungus from producing ATP (energy).
- Paralyzes Zoospores: Oomycetes spread via swimming zoospores. Stunner cuts their energy, rendering them immobile so they cannot infect new leaves or tubers.
- Stops Sporulation: It acts as an anti-sporulant, preventing the fungus from releasing new spores and halting the spread of the disease to neighboring plants.
Note: Because it attacks a different site than Strobilurins (which attack the Qo site), there is no cross-resistance.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Grape | Downy Mildew (Plasmopara viticola) |
| Potato | Late Blight (Phytophthora infestans) |
| Tomato | Late Blight (Phytophthora infestans) |
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) |
|---|---|---|---|---|
| Grape | 80 ml | 200 - 400 L | 0.2 - 0.4 ml/L | Use before fruit pruning / Check export limits |
| Potato | 80 ml | 200 L | 0.4 ml/L | 7 Days |
| Tomato | 80 ml | 200 L | 0.4 ml/L | 3 - 7 Days |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
- Timing: Apply prophylactically (preventively) when weather conditions favor blight (cloudy, humid), or at the very first sign of disease. Do not wait for severe infection.
- Mixing: Stunner mixes well with most insecticides and fungicides. However, avoid mixing with highly alkaline substances like Bordeaux Mixture, as this can reduce efficacy.
- Coverage: Ensure thorough coverage of the canopy. For grapes, target the bunch zone. For potatoes, ensure the lower leaves are sprayed to prevent tuber infection.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Is Stunner a systemic fungicide?
It is primarily a contact fungicide with strong translaminar activity. It penetrates the leaf to protect the underside but does not move fully through the plant system (acropetally).
2. Can I use Stunner for export-quality grapes?
Yes. Cyazofamid has a favorable MRL (Maximum Residue Limit) profile for the EU. Ensure you stop spraying roughly 30-40 days before harvest to stay well within safety limits.
3. Can I mix Stunner with other fungicides?
Yes, it is often mixed with contact fungicides like Mancozeb or Chlorothalonil for broader protection. Avoid mixing with strong alkalis.
4. How soon is it rainfast?
Stunner is rainfast within 1 to 4 hours after application, making it an excellent choice during the monsoon season.
5. Does it cure the disease once it has spread?
Stunner is best used as a preventative or early-intervention tool. It stops the spread (anti-sporulant) but is not designed to cure heavy, established infections like some systemic chemicals.
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.