Difenoconazole 150g/L + Propiconazole 50g/L + Tebuconazole 150g/L 350EC: Systemic Triazole Fungicide for Crop Disease Control

Introduction

Difenoconazole 150g/L + Propiconazole 50g/L + Tebuconazole 150g/L 350EC is a systemic triazole fungicide formulation developed for the management of important fungal diseases in agricultural crops.

The formulation contains:

• Difenoconazole — 150g/L

• Propiconazole — 50g/L

• Tebuconazole — 150g/L

Total active ingredient concentration:

350g/L

An official Vietnamese plant-protection registration list includes this exact 150 + 50 + 150g/L 350EC combination, with registered uses including rice grain discoloration, rice sheath blight and coffee rust. (PPD)

The three active ingredients are all triazole fungicides belonging to:

FRAC Group 3 — DMI Fungicides

DMI means:

Demethylation Inhibitor

FRAC classifies Difenoconazole, Propiconazole and Tebuconazole in the same Group 3 category, where they inhibit C14-demethylase (CYP51) in fungal sterol biosynthesis. (Frac)

This gives the formulation broad systemic fungicidal activity, but it is important to understand that the three ingredients do not represent three independent modes of action.

What Is This 350EC Formulation?

The formulation combines three triazole active ingredients in an:

EC — Emulsifiable Concentrate

The concentration is calculated as:

150g/L + 50g/L + 150g/L = 350g/L

Each active ingredient contributes to the fungicidal profile of the formulation.

Difenoconazole

Difenoconazole is a systemic DMI fungicide widely used against a range of fungal diseases.

It is commonly associated with:

• Preventive activity

• Early curative activity

• Systemic movement

• Broad disease-management potential

Propiconazole

Propiconazole is another systemic triazole fungicide.

It is widely used in disease-management programs because of its:

• Rapid plant uptake

• Systemic activity

• Preventive action

• Curative activity during early infection stages

Tebuconazole

Tebuconazole is a widely used systemic DMI fungicide with activity against many fungal pathogens.

It contributes:

• Preventive protection

• Early curative activity

• Systemic redistribution

• Disease suppression after infection has begun

Combining the three active ingredients can broaden practical disease-management performance within the DMI fungicide class.

How Does the Fungicide Work?

All three active ingredients target fungal sterol biosynthesis.

Fungal cells require sterols, particularly ergosterol-related compounds, to maintain healthy cell membranes.

FRAC identifies the target site for Group 3 DMI fungicides as:

C14-demethylase in sterol biosynthesis — erg11 / CYP51. (Frac)

After fungicide exposure:

1. C14-demethylase activity is inhibited.

2. Normal sterol production is disrupted.

3. Fungal cell membranes cannot develop normally.

4. Hyphal growth becomes restricted.

5. Disease development is suppressed.

This gives DMI fungicides their characteristic systemic and curative properties.

Preventive and Curative Activity

One major advantage of systemic triazole fungicides is that they can provide both:

Preventive protection

and

Early curative activity

Preventive applications protect healthy plant tissue before severe infection develops.

Early curative applications may suppress fungal development shortly after infection begins.

However, fungicides generally perform best when applied:

Before disease pressure becomes severe

rather than after extensive crop damage has already occurred.

Good disease-management programs therefore depend on:

• Field monitoring

• Weather conditions

• Disease history

• Crop growth stage

• Early symptom detection

Which Diseases Can This Combination Control?

The exact disease spectrum depends on national registration and product label.

The official Vietnamese registration list for this exact 350EC combination includes uses against:

• Rice grain discoloration

• Rice sheath blight

• Coffee rust (PPD)

Other DMI fungicides are used globally against various fungal disease groups, but this does not mean every crop or disease is automatically approved for this specific formulation.

Commercial claims should always follow:

Local Registration + Approved Crop + Approved Disease + Registered Label

Rice Disease Management

Rice is one of the important markets for triazole fungicide combinations.

For the registered 350EC combination cited above, official Vietnamese records include:

Rice Grain Discoloration

Grain discoloration can involve several fungal organisms and can reduce:

• Grain appearance

• Market quality

• Seed quality

• Commercial value

Correct timing around panicle development can be important in registered programs.

Rice Sheath Blight

Rice sheath blight develops rapidly under:

• High humidity

• Dense crop canopy

• Warm conditions

• High nitrogen environments

Systemic fungicides can help suppress disease development when applied according to registered recommendations.

Coffee Rust Management

The same official registration also lists this 350EC combination for:

Coffee rust

Coffee rust is an economically important foliar disease that can cause:

• Leaf lesions

• Premature defoliation

• Reduced photosynthetic capacity

• Lower crop productivity

Disease control is most effective when fungicides are integrated with:

• Disease monitoring

• Canopy management

• Appropriate nutrition

• Resistant varieties where available

• Fungicide resistance management

Why Combine Three Triazoles?

The formulation combines three different active ingredients with somewhat different physicochemical and biological profiles.

Potential practical benefits may include:

• Broad disease spectrum

• Systemic activity

• Preventive protection

• Early curative action

• Improved consistency under different disease situations

However, the formulation should not be described as a three-mode-of-action fungicide.

All three active ingredients belong to:

FRAC Group 3

and act on the same general target site.

This distinction is especially important for resistance-management claims.

Resistance Management

FRAC classifies DMI fungicides as having a medium resistance risk and notes that resistance has developed in multiple fungal species. (Frac)

Known resistance mechanisms include:

• Mutations in the CYP51 target gene

• Increased CYP51 expression

• Changes in transporter systems

• Other metabolic adaptations

FRAC also states that it is generally wise to assume cross-resistance between DMI fungicides active against the same fungus. (Frac)

Therefore:

Difenoconazole + Propiconazole + Tebuconazole should still be treated as one FRAC Group 3 resistance-management unit.

Why Changing Between the Three Ingredients Is Not True Rotation

A common misunderstanding is that using three different triazoles automatically creates strong resistance rotation.

It does not.

Because all three active ingredients target CYP51, switching from:

• Difenoconazole
  to

• Propiconazole
  to

• Tebuconazole

does not represent rotation between different FRAC groups.

A stronger resistance-management program should rotate or combine registered fungicides with:

Different FRAC Modes of Action

where permitted by local labels and resistance-management recommendations.

How to Improve Disease-Control Performance

Several factors influence field performance.

Apply at the Correct Time

Applications are generally more effective when disease pressure is low to moderate.

Ensure Good Spray Coverage

Uniform coverage improves fungicide exposure across the crop canopy.

Use the Registered Rate

Avoid reducing rates below label recommendations.

Consider Disease Pressure

Heavy disease pressure may require a more intensive registered program.

Monitor Weather

High humidity and prolonged leaf wetness often increase fungal infection pressure.

What Does EC Formulation Mean?

EC means:

Emulsifiable Concentrate

The active ingredients are dissolved in a solvent system with emulsifiers.

After dilution in water, the formulation should form a stable spray emulsion.

A high-quality 350EC product should provide:

• Rapid emulsification

• Uniform dilution

• Good emulsion stability

• Consistent active ingredient concentration

• Stable storage performance

Why Is EC Formulation Quality Important?

Products containing the same active ingredients may not perform identically if formulation quality differs.

Important quality factors include:

• Solvent quality

• Emulsifier system

• Active ingredient purity

• Water compatibility

• Storage stability

• Batch consistency

Poor formulation quality may cause:

• Separation

• Precipitation

• Unstable dilution

• Uneven spray distribution

For professional buyers, formulation quality is therefore as important as the declared active ingredient concentration.

OEM and Private Label Manufacturing

Difenoconazole + Propiconazole + Tebuconazole 350EC can be supplied for OEM and private-label markets where legally permitted.

Customization may include:

• Brand name

• Label design

• Bottle size

• Packaging materials

• Outer carton

• Language

• Market-specific artwork

Common packaging options may include:

• 100mL

• 250mL

• 500mL

• 1L

• Larger commercial packaging

Final packaging should always comply with destination-market pesticide regulations.

What Should Buyers Check Before Purchasing?

Professional importers and distributors should evaluate several areas.

Active Ingredient Specification

Confirm:

Difenoconazole 150g/L + Propiconazole 50g/L + Tebuconazole 150g/L

Total Concentration

Confirm:

350g/L

Formulation Type

Confirm:

350EC

Certificate of Analysis

Check:

• Active ingredient content

• Appearance

• Relevant physical properties

Emulsion Stability

The product should form a stable emulsion after dilution.

Storage Stability

The formulation should remain within specification during the declared shelf life.

Batch Consistency

Different production batches should maintain consistent quality.

Documentation for International Buyers

Professional pesticide suppliers should normally provide documentation such as:

• Certificate of Analysis — COA

• Safety Data Sheet — SDS

• Technical Data Sheet — TDS

• Product specification

• Manufacturing information

• Packaging specification

Depending on destination market, buyers may also require:

• Registration support

• Free Sale Certificate

• Authorization documents

• Product samples

• Stability data

Why Factory Supply Matters

For B2B agricultural pesticide customers, direct factory supply may support:

OEM Customization

Development of customer-owned brands.

Flexible Packaging

Packaging adapted to local market preferences.

Batch Control

Production under standardized manufacturing procedures.

Documentation Support

Technical documents for import and registration processes.

Long-Term Supply

Stable formulation and packaging specifications across repeated orders.

Price alone should not be the main supplier-selection criterion.

Frequently Asked Questions

How does Difenoconazole + Propiconazole + Tebuconazole 350EC control fungal diseases?

The three active ingredients inhibit fungal C14-demethylase, disrupting sterol biosynthesis and normal cell-membrane development.

How are the three active ingredients classified?

Difenoconazole, Propiconazole and Tebuconazole are all FRAC Group 3 DMI fungicides.

How can this fungicide help protect rice crops?

The exact 150 + 50 + 150g/L 350EC formulation is officially listed in Vietnam for rice grain discoloration and rice sheath blight, subject to registered application requirements.

How should resistance to this product be managed?

Do not treat the three triazoles as three independent modes of action. Rotate with fungicides from different FRAC groups where registered and appropriate.

How can buyers customize this 350EC formulation?

OEM manufacturers can support customized branding, bottle sizes, labels, cartons and market-specific packaging subject to regulatory requirements.

Conclusion

Difenoconazole 150g/L + Propiconazole 50g/L + Tebuconazole 150g/L 350EC is a systemic triazole fungicide combining three established DMI active ingredients.

Its main technical characteristics include:

Systemic Activity + Preventive Protection + Early Curative Activity + Broad Fungal Disease Management

The biological mechanism is:

FRAC Group 3 → C14-Demethylase / CYP51 Inhibition → Sterol Biosynthesis Disruption → Fungal Growth Suppression

The exact 350EC formulation has been officially listed for agricultural uses including:

• Rice grain discoloration

• Rice sheath blight

• Coffee rust (PPD)

However, resistance management remains essential because:

Difenoconazole + Propiconazole + Tebuconazole = Three Active Ingredients, but One FRAC Group

For growers, successful disease control depends on:

Correct Timing + Registered Rate + Good Coverage + Disease Monitoring + Resistance Management

For importers and distributors, a professional product should combine:

Stable 350EC Formulation + Batch Consistency + Technical Documentation + OEM Capability + Regulatory Compliance

Authoritative References

1. Fungicide Resistance Action Committee — FRAC Code List 2025
   Official classification of Difenoconazole, Propiconazole and Tebuconazole as FRAC Group 3 DMI fungicides targeting C14-demethylase/CYP51. (Frac)

2. FRAC SBI Fungicides Working Group
   Technical information on DMI fungicides, cross-resistance and resistance-management principles. (Frac)

3. Vietnam Plant Protection Department — Approved Plant Protection Products List
   Official listing containing Difenoconazole 150g/L + Propiconazole 50g/L + Tebuconazole 150g/L 350EC and registered disease uses. (PPD)