Tebuconazole 38.39% SC (Buonos) – A Complete Guide for Farmers

Introduction to Tebuconazole 38.39% SC (Buonos)

Tebuconazole 38.39% SC, marketed as Buonos, is a systemic triazole fungicide widely used to control a broad spectrum of fungal diseases in crops. It belongs to the demethylation inhibitor (DMI) class and is effective against rusts, powdery mildews, leaf spots, and blights in cereals, pulses, vegetables, and horticultural crops.

Developed by Bayer CropScience, Buonos is known for its protective, curative, and eradicative action against fungal pathogens. Its long-lasting residual effect and plant health benefits make it a preferred choice among farmers.

Key Features of Tebuconazole 38.39% SC (Buonos)

Property	Details
Chemical Class	Triazole Fungicide
Mode of Action	Demethylation Inhibitor (DMI)
Formulation	Suspension Concentrate (SC)
Target Diseases	Rusts, Powdery Mildew, Leaf Spots, Blights
Primary Crops	Wheat, Rice, Soybean, Grapes, Vegetables
Residual Effect	14-21 days
Toxicity (WHO Class)	Moderately Hazardous (Class II)

Mode of Action

Tebuconazole works by:
✔ Inhibiting ergosterol biosynthesis in fungal cell membranes.
✔ Disrupting membrane integrity, leading to fungal death.
✔ Providing systemic protection through xylem mobility.

It offers three-way action:

Protective – Prevents fungal infection.
Curative – Stops existing infections.
Eradicative – Eliminates dormant spores.

Target Diseases Controlled by Buonos

1. Cereal Crops (Wheat, Rice, Maize)

Leaf Rust (Puccinia triticina)
Powdery Mildew (Blumeria graminis)
Sheath Blight (Rhizoctonia solani)

2. Horticultural Crops (Grapes, Mango, Banana)

Anthracnose (Colletotrichum spp.)
Downy Mildew (Plasmopara viticola)

3. Vegetables (Tomato, Potato, Onion)

Early Blight (Alternaria solani)
Purple Blotch (Alternaria porri)

Application & Dosage Recommendations

1. Recommended Crops & Dosage

Crop	Disease	Dosage (ml/acre)	Application Method
Wheat	Leaf Rust	200-250	Foliar Spray
Rice	Sheath Blight	300-350	Foliar Spray
Grapes	Powdery Mildew	150-200	Foliar Spray
Tomato	Early Blight	200-250	Foliar Spray
Soybean	Rust	250-300	Foliar Spray

2. Best Practices for Application

✔ Apply at first disease symptoms for best results.
✔ Use high-volume sprayers for uniform coverage.
✔ Avoid spraying during high temperatures (>30°C).
✔ Maintain 7-10 day intervals between sprays.

Advantages of Using Buonos

1. Broad-Spectrum Disease Control

Effective against both foliar and soil-borne fungi.

2. Systemic Action

Moves upward in the plant (xylem-mobile).

3. Long Residual Effect

Provides 2-3 weeks of protection.

4. Plant Health Benefits

Enhances chlorophyll production (greener leaves).

5. Resistance Management

Can be rotated with strobilurins (e.g., Azoxystrobin).

Disadvantages & Limitations

1. Resistance Risk

⚠ Overuse can lead to fungal resistance (rotate with other fungicides).

2. Phytotoxicity Risk

⚠ High doses may cause leaf burn in sensitive crops.

3. Not for All Diseases

Ineffective against Oomycetes (e.g., late blight).

Safety & Environmental Impact

1. Toxicity Profile

Moderately toxic (WHO Class II).
Safe for bees when used as directed.

2. Pre-Harvest Interval (PHI)

14-30 days depending on crop.

3. Resistance Management

Rotate with fungicides of different MoA classes.

Comparison with Other Fungicides

Fungicide	Mode of Action	Best For	Residual Effect
Tebuconazole	DMI Inhibitor	Rusts, Powdery Mildew	14-21 days
Azoxystrobin	QoI Inhibitor	Early Blight, Downy Mildew	7-10 days
Mancozeb	Multi-Site Inhibitor	Broad-Spectrum Protection	5-7 days

Farmer Feedback & Case Studies

Wheat Farmers (Punjab, India): Reported 25% higher yields with Buonos.
Grape Growers (Nashik, Maharashtra): Controlled powdery mildew effectively.
Tomato Cultivators (Andhra Pradesh): Reduced early blight damage by 80%.

Conclusion: Should You Use Buonos?

Yes, for rusts, mildews, and leaf spots.
No, for oomycete diseases (e.g., late blight).

Best Practices:

Follow recommended dosage.
Rotate with non-DMI fungicides.

FAQs

Q1. Can Tebuconazole be mixed with insecticides?
A: Yes, but check compatibility (avoid alkaline mixes).

Q2. How soon can I reapply Buonos?
A: After 14 days (if disease pressure persists).

Q3. Is Buonos safe for organic farming?
A: No, it’s a synthetic fungicide.

Q4. What’s the shelf life?
A: 2 years if stored properly.

For customized fungicide plans, consult an agronomist!

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