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Crop Protection & Pesticides

Curzate Fungicide: Cymoxanil + Mancozeb Uses & Spray Guide

Curzate is a dual-action systemic and contact fungicide combining Cymoxanil 8% and Mancozeb 64% WP, manufactured by Corteva Agriscience. It delivers curative, translaminar, and protective control against destructive downy mildew and late blight diseases across potato, tomato, and grape crops.

Last reviewed: 10 November 2026

Active ingredients and dual-action mechanism

Curzate combines an aliphatic nitrogen systemic fungicide (Cymoxanil) with a multi-site contact protectant (Mancozeb) to attack fungal pathogens inside and outside plant tissues.

Cymoxanil rapidly penetrates leaf surfaces via translaminar movement to arrest fungal mycelial growth even after initial infection has occurred, while Mancozeb forms an impervious protective layer on the leaf exterior.

  • Cymoxanil (8% WP): Systemic, translaminar curative action arresting early internal pathogen development.
  • Mancozeb (64% WP): Multi-site contact protectant preventing fungal spore germination on the plant surface.
  • Post-infection kickback: Provides strong curative action when sprayed within 24 to 48 hours of infection occurrence.

Target crops and approved fungal diseases

Curzate is registered for controlling aggressive oomycete plant pathogens that cause rapid foliage collapse during cool, humid weather.

It is especially valued by potato and vegetable growers facing severe late blight outbreaks.

  • Potato: Late blight (Phytophthora infestans) affecting foliage and stems.
  • Tomato: Late blight and early blight foliar complexes.
  • Grapes: Downy mildew (Plasmopara viticola) damaging leaves, shoots, and young berry clusters.
  • Cucurbits: Downy mildew on cucumber, melon, and gourds.

Application timing, spray techniques, and safety

For maximum protection, apply Curzate upon receiving weather alerts for cool, overcast, and rainy conditions, or upon noticing initial lesions.

Ensure uniform spray deposition on both the upper and lower leaf surfaces where downy mildew and late blight sporulation occurs.

  • Spraying technique: Use hollow cone nozzles with adequate water volume for thorough leaf canopy coverage.
  • Resistance management: Alternate with non-cross-resistant chemistries to preserve fungicide efficacy over successive seasons.
  • Personal protective equipment: Wear rubber gloves, protective goggles, and face shield; respect official pre-harvest intervals.

Official source

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Central Insecticides Board & Registration Committee ↗

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Common questions

What active ingredients are present in Curzate fungicide?

Curzate contains Cymoxanil 8% and Mancozeb 64% in a wettable powder (WP) formulation.

How quickly does Curzate protect crops against late blight?

Its systemic ingredient Cymoxanil penetrates foliage within hours, providing rapid curative kickback against early late blight infection.

Is Curzate a curative or preventive fungicide?

Curzate is both preventive and curative; Mancozeb protects the surface while Cymoxanil cures early internal fungal infections.

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.

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