Cymoxanil 60g/kg + Mancozeb 700g/kg WP: Protective and Curative Fungicide for Downy Mildew and Late Blight Control

Introduction

Cymoxanil 60g/kg + Mancozeb 700g/kg WP is a combination fungicide developed mainly for the management of important oomycete diseases, especially downy mildew and late blight.

The formulation contains:

• Cymoxanil — 60g/kg

• Mancozeb — 700g/kg

Total active ingredient concentration:

760g/kg

The two active ingredients have complementary characteristics:

Cymoxanil → locally systemic / penetrant activity with early curative action

Mancozeb → multi-site contact protectant fungicide

This combination provides both:

Disease Protection + Early Infection Suppression

and is commonly positioned for diseases such as:

• Potato late blight

• Tomato late blight

• Grape downy mildew

• Cucumber downy mildew

• Melon downy mildew

• Other registered oomycete diseases

University disease-management recommendations also recognize cymoxanil as an important fungicide for late blight and downy mildew programs, while commonly recommending that it be used together with an effective protectant fungicide.

What Is Cymoxanil + Mancozeb WP?

This formulation combines two fungicides with substantially different biological characteristics.

Cymoxanil

Cymoxanil belongs to the:

Cyanoacetamide-oxime

chemical group.

Current FRAC materials list Cymoxanil in:

FRAC Group U27

with its precise biochemical mode of action still classified as uncertain.

Cymoxanil is valued because it can penetrate treated plant tissue and provide activity during the early stages of infection.

It is therefore commonly described as providing:

• Penetrant activity

• Local systemic movement

• Preventive action

• Early curative activity

• Short-term disease suppression after infection begins

Mancozeb

Mancozeb is a broad-spectrum, multi-site contact fungicide.

It belongs to:

FRAC Group M03

and provides preventive protection on plant surfaces.

Mancozeb acts at multiple biochemical sites in fungal pathogens rather than targeting only one specific enzyme or pathway.

This multi-site activity is one reason Mancozeb has historically been important in fungicide resistance-management programs.

Its main characteristics include:

• Contact activity

• Preventive protection

• Multi-site mode of action

• Broad-spectrum fungal disease suppression

How Does the Combination Work?

The formulation combines:

Cymoxanil's penetrant and early curative activity

with:

Mancozeb's surface protection and multi-site activity

After spraying, Mancozeb remains primarily on the plant surface and creates a protective barrier.

When spores land on a properly treated surface, Mancozeb can interfere with several metabolic processes involved in germination and infection.

Cymoxanil, in contrast, penetrates treated plant tissue and can act on infection that has recently started.

This creates a complementary disease-control strategy:

Outside the leaf → Mancozeb protects

Inside treated tissue → Cymoxanil suppresses early infection

Why Is This Combination Useful Against Oomycete Diseases?

Late blight and downy mildew pathogens can develop very rapidly under favorable weather conditions.

Typical risk factors include:

• High relative humidity

• Prolonged leaf wetness

• Frequent rainfall

• Dense crop canopy

• Moderate temperatures favorable for infection

Once environmental conditions become favorable, disease cycles can occur rapidly.

A protectant-only fungicide may be less forgiving if application is delayed.

A curative component alone may not provide enough long-term surface protection.

Combining Cymoxanil with Mancozeb helps address both needs.

Late Blight Control

Late blight is one of the most important diseases of potato and tomato.

It is associated with:

Phytophthora infestans

Under favorable conditions, late blight can spread rapidly through foliage and potentially affect stems and tubers or fruit-production systems.

Typical symptoms may include:

• Water-soaked leaf lesions

• Brown or dark necrotic areas

• Rapid leaf collapse

• White sporulation under humid conditions

Cymoxanil is widely included in late-blight management programs.

University recommendations for potato disease management list cymoxanil products for late blight and specifically advise combining cymoxanil with an effective protectant fungicide.

This is exactly the technical logic behind the Cymoxanil + Mancozeb combination.

Downy Mildew Control

Downy mildew diseases occur in crops including:

• Grapes

• Cucumbers

• Melons

• Watermelons

• Squash

• Other susceptible vegetables

These diseases are favored by moisture and humid crop canopies.

Symptoms may include:

• Yellow angular lesions

• Chlorosis

• Necrotic patches

• Sporulation on lower leaf surfaces

• Premature leaf loss

Cymoxanil appears in university fungicide programs for cucurbit downy mildew, while Mancozeb remains an important multi-site protectant in many disease-management programs.

Preventive and Early Curative Activity

An important advantage of this combination is that it should not be viewed only as a preventive fungicide.

Preventive Protection

Mancozeb helps protect healthy plant surfaces before pathogen penetration.

Early Curative Activity

Cymoxanil can suppress infection shortly after the infection process begins.

However, this does not mean the product can reverse severe disease.

Once large areas of crop tissue have already been destroyed, fungicides cannot restore dead plant tissue.

The best performance usually comes from:

Early Detection + Timely Application + Good Coverage

Why Is Application Timing Important?

Timing is critical for late blight and downy mildew management.

Growers should consider:

• Weather forecasts

• Disease warnings

• Previous disease history

• Crop growth stage

• First symptoms

• Disease pressure in nearby fields

A product containing Cymoxanil + Mancozeb is generally more useful when applied:

before severe disease establishment or during the earliest stages of infection

rather than after an epidemic has become established.

Why Is Spray Coverage Important?

Mancozeb is primarily a contact protectant.

Therefore, untreated plant surfaces receive less protection.

Important application factors include:

• Correct water volume

• Suitable nozzle selection

• Uniform droplet distribution

• Coverage of upper and lower leaf surfaces

• Crop canopy penetration

As the crop canopy expands, newly developed plant tissue may not contain sufficient protectant residue.

Spray programs should therefore follow local label intervals and disease-pressure recommendations.

What Does WP Mean?

WP stands for:

Wettable Powder

A WP formulation contains finely divided active ingredients and formulation additives designed to disperse in water.

Before application, the powder is mixed with water to create a suspension.

A high-quality WP formulation should provide:

• Good wettability

• Rapid dispersion

• Stable suspension

• Limited sedimentation

• Easy remixing

• Uniform active ingredient distribution

Why Is WP Formulation Quality Important?

Not all products containing the same active ingredient concentration perform equally.

Important physical-quality indicators include:

Wettability

The powder should become thoroughly wet after entering water.

Suspensibility

Active ingredient particles should remain uniformly suspended long enough for effective spraying.

Particle Size

Proper particle-size distribution helps improve suspension stability and spray performance.

Moisture Content

Excess moisture can negatively affect powder stability during storage.

Batch Consistency

Different manufacturing batches should remain within established specification limits.

For international buyers, these formulation characteristics can be as important as the active ingredient content itself.

Resistance Management

Resistance management is particularly important for oomycete fungicides.

Cymoxanil is currently classified by FRAC in Group U27, while Mancozeb belongs to the multi-site M03 group.

The inclusion of Mancozeb provides a multi-site partner, which is useful from a resistance-management perspective.

However, growers should still avoid relying continuously on one fungicide combination throughout an entire season.

A stronger program can include:

• Fungicides from different FRAC groups

• Multi-site protectants

• Disease forecasting

• Resistant varieties

• Crop sanitation

• Appropriate irrigation management

Rutgers University disease-management guidance similarly emphasizes rotation among different FRAC groups when controlling cucurbit downy mildew.

Why Should Cymoxanil Not Be Used Alone Repeatedly?

University recommendations commonly pair cymoxanil with another effective protectant.

For example, regional potato recommendations state that cymoxanil should be used in combination with a labeled protectant fungicide.

This strategy provides:

• Additional surface protection

• Broader disease-management support

• Reduced dependence on a single fungicide target

• More robust resistance management

The Cymoxanil + Mancozeb formulation already incorporates this complementary concept.

Integrated Disease Management

Fungicides should form only one part of disease-management programs.

A good IPM strategy may include:

Resistant Varieties

Use resistant or tolerant cultivars when available.

Field Sanitation

Remove infected crop residues or volunteer plants where appropriate.

Irrigation Management

Avoid unnecessary periods of prolonged leaf wetness.

Crop Ventilation

Improve canopy airflow where crop production systems allow.

Disease Monitoring

Scout regularly and respond before disease becomes severe.

Fungicide Rotation

Use different FRAC groups according to registered recommendations.

These measures can reduce disease pressure and improve fungicide reliability.

OEM and Private Label Manufacturing

Cymoxanil 60g/kg + Mancozeb 700g/kg WP can be supplied for OEM and private-label markets where registration permits.

Customization options may include:

• Brand name

• Packaging design

• Bag size

• Bottle or pouch type

• Label language

• Outer cartons

• Market-specific artwork

Typical commercial packaging may include:

• 100g

• 250g

• 500g

• 1kg

• Larger agricultural packages

Actual packaging should be selected according to local registration and transportation requirements.

What Should Buyers Check Before Purchasing?

Professional buyers should verify several key specifications.

Active Ingredient Content

Confirm:

Cymoxanil 60g/kg

and

Mancozeb 700g/kg

Total Active Ingredient

Confirm:

760g/kg

Formulation

Confirm:

WP — Wettable Powder

Physical Quality

Evaluate:

• Wettability

• Suspensibility

• Particle size

• Moisture

• Appearance

Technical Documents

Request:

• Certificate of Analysis — COA

• Safety Data Sheet — SDS

• Technical Data Sheet — TDS

• Product specification

Storage Stability

Confirm that physical and chemical specifications remain stable during the declared shelf life.

Why Choose Factory OEM Supply?

For importers and agricultural distributors, direct factory production can provide:

Private Label Service

Customers can develop their own agricultural brand.

Customized Packaging

Package sizes can be adjusted to local customer requirements.

Technical Documentation

Factories can provide technical specifications and quality documents.

Batch Control

Standardized production improves consistency across different shipments.

Registration Support

Where available, manufacturers can provide technical documents needed for national registration processes.

Frequently Asked Questions

How does Cymoxanil + Mancozeb control late blight?

Mancozeb provides preventive surface protection, while Cymoxanil penetrates treated tissue and provides activity against early stages of infection.

How does this fungicide help manage downy mildew?

The combination provides both contact protection and penetrant activity, helping prevent new infections and suppress very early disease development when used according to the registered label.

How should resistance be managed?

Rotate with fungicides from different FRAC groups and avoid relying continuously on Cymoxanil-containing products throughout the entire crop cycle.

How important is spray coverage?

Coverage is very important because Mancozeb acts primarily as a contact protectant. Uniform spray distribution improves protection of susceptible crop tissue.

How can buyers customize the product?

OEM manufacturers can provide private labels, customized packaging, local-language labels and market-specific product specifications according to regulatory requirements.

Conclusion

Cymoxanil 60g/kg + Mancozeb 700g/kg WP combines two complementary fungicide characteristics:

Cymoxanil → Penetrant + Early Curative Activity

Mancozeb → Contact + Preventive + Multi-Site Protection

This makes the combination particularly suitable for registered disease-management programs targeting:

• Late blight

• Downy mildew

• Other susceptible oomycete diseases

Its practical disease-control strategy can be summarized as:

Early Infection Suppression + Surface Protection + Multi-Site Support

For growers, successful performance depends on:

Early Application + Good Coverage + Correct Rate + Weather Monitoring + Resistance Management

For professional importers and distributors, product quality depends on more than the declared active ingredients.

A reliable commercial product should provide:

Correct Active Ingredient Content + High WP Suspensibility + Good Wettability + Batch Consistency + Regulatory Compliance + Stable OEM Supply

Authoritative References

1. Fungicide Resistance Action Committee (FRAC)
   Current mode-of-action classification resources listing Cymoxanil in Group U27 and providing guidance on multi-site fungicides.

2. New England Vegetable Management Guide — Potato Disease Control
   University-based recommendations describing cymoxanil use in late-blight programs and the importance of combining it with an effective protectant fungicide.

3. Rutgers University Plant & Pest Advisory
   Downy mildew management guidance emphasizing rotation among fungicides with different FRAC modes of action.

4. New England Vegetable Management Guide — Cucurbit Disease Management
   University guidance covering Cymoxanil and Mancozeb-containing disease-management programs for cucurbit crops.