Chemical composition and dual mode of action
- Metalaxyl-M (Mefenoxam 4%): Phenylamide systemic fungicide (FRAC Group 4) that inhibits fungal RNA polymerase, arresting pathogen development inside plant tissue; moves acropetally to protect newly expanding leaves.
- Mancozeb (64%): Multi-site contact protectant (FRAC Group M03) that forms an impenetrable chemical barrier on leaf surfaces, disrupting multiple fungal enzyme processes.
- Resistance durability: Combining systemic Metalaxyl-M with multi-site Mancozeb prevents the development of resistant fungal strains.
CIBRC approved target crops and diseases
Registered under CIBRC label directions for managing Late blight (Phytophthora infestans) in potato and tomato; Downy mildew (Plasmopara viticola) in grapes; Downy mildew in mustard and cucurbits; and Damping-off (Pythium spp.) in vegetable and tobacco nurseries.
Application timing, dosage and safety
- Apply preventively when weather conditions (cloudy, cool, and humid) favor fungal disease outbreak, or at the first sign of water-soaked foliar lesions.
- Ensure uniform spraying of both upper and lower leaf surfaces using a hollow cone nozzle.
- Observe the mandatory crop-specific Pre-Harvest Interval (PHI) printed on the product packaging before harvest.
- Wear personal protective gear and avoid spraying during high wind or mid-day heat.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
What are the active chemical ingredients in Ridomil Gold?
Ridomil Gold contains Metalaxyl-M 4% + Mancozeb 64% formulated as a Wettable Powder (WP).
Why is Ridomil Gold considered effective for potato late blight?
It combines systemic Metalaxyl-M to cure internal fungal infections with protective Mancozeb to prevent new spores from germinating on the leaves.
What is the formulation type of Ridomil Gold?
It is formulated as a Wettable Powder (WP) that mixes smoothly in water for uniform foliar spray and nursery drenching.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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