Mancozeb

Gray-yellow powder. Decomposes before melting. Practically insoluble in water and most organic solvents. Stable under normal storage conditions, but decomposes under humid and acidic conditions and at elevated temperatures.

Foliar protection fungicide, widely used in fruit trees, vegetables and field crops to control a variety of important foliar fungal diseases.

Mancozeb is a widely used protective fungicide in the dithiocarbamate chemical group. Known for its broad-spectrum activity, it is effective against a variety of fungal diseases in crops, making it a staple in agricultural disease management.

Key Features

1. Chemical Class: Ethylene bis(dithiocarbamate) compound.

2. Mode of Action: Multi-site contact fungicide, disrupting multiple enzyme systems in fungi.

3. Formulations: Available as wettable powders (WP), water-dispersible granules (WDG), and suspension concentrates (SC).

4. Compatibility: Often used in combination with systemic fungicides for enhanced protection.

Applications

Crops

• Vegetables: Potatoes, tomatoes, and onions.

• Fruits: Apples, grapes, and bananas.

• Field Crops: Rice, wheat, and peanuts.

Target Diseases

• Late blight (Phytophthora infestans) in potatoes and tomatoes.

• Downy mildew (Plasmopara spp.) in grapes and cucurbits.

• Leaf spots (Alternaria spp., Cercospora spp.).

• Rusts, anthracnose, and scabs in various crops.

Mode of Action

Mancozeb acts as a protective fungicide by forming a protective barrier on plant surfaces. It interferes with multiple fungal enzymes by reacting with sulfhydryl (–SH) groups, disrupting fungal metabolism and spore germination.

Advantages

1. Broad-Spectrum Control: Effective against a wide range of fungal pathogens.

2. Multi-Site Action: Reduces the risk of resistance development.

3. Compatibility: Can be mixed with systemic fungicides for dual action.

4. Environmentally Stable: Provides long-lasting protection under various weather conditions.

Usage Guidelines

1. Application Timing: Apply preventively or at the first sign of disease.

2. Dosage: Follow specific crop and disease recommendations provided by the manufacturer.

3. Reapplication Interval: Typically 7–14 days, depending on disease pressure and weather conditions.

4. Mixing: Ensure uniform dispersion in water for effective coverage.

Safety and Environmental Considerations

Handling and Storage

• Protective Measures: Wear gloves, goggles, and a mask during application.

• Storage: Store in a cool, dry place, away from food and animal feed.

Environmental Impact

• Aquatic Toxicity: Avoid contamination of water bodies due to toxicity to aquatic organisms.

• Degradation: Decomposes in soil and water, leaving minimal residues.

Human Health Risks

• Toxicity: Low acute toxicity; however, prolonged exposure may cause skin or eye irritation.

• First Aid:

  • Skin Contact: Wash with soap and water.

  • Eye Contact: Rinse thoroughly with water.

  • Inhalation: Move to fresh air and seek medical attention if symptoms persist.

  
  

Limitations

1. Protective Action Only: Does not cure established infections; requires preventive use.

2. Rainfastness: May require reapplication after heavy rainfall.

3. Residue Management: Ensure pre-harvest intervals are observed to minimize residues.

Conclusion

Mancozeb is a reliable and effective fungicide for managing fungal diseases across diverse crops. Its broad-spectrum activity, resistance management benefits, and compatibility with other fungicides make it a valuable tool in integrated pest management programs. Proper use ensures healthy crops and sustainable yields.