Active composition and dual mode of action
- Active ingredients: Metalaxyl-M 4% (systemic phenylamide, FRAC Group 4) + Mancozeb 64% WP (contact dithiocarbamate, FRAC Group M03).
- Metalaxyl-M systemic power: Highly active enantiomer that rapidly penetrates plant tissues, translocating acropetally to protect newly expanding leaves and shoots.
- Mancozeb protective shield: Creates a multi-site contact barrier on leaf surfaces that prevents fungal zoospore germination.
- RNA polymerase inhibition: Metalaxyl-M specifically inhibits RNA polymerase I in oomycetes, arresting mycelial expansion curatively inside plant tissues.
Target diseases and approved crop spectrum
- Potato: Benchmark control of Late Blight (Phytophthora infestans), preventing haulm destruction and tuber rot.
- Tomato: Controls Late Blight, damping-off, and fruit rot.
- Grapes: Provides industry-standard control of Downy Mildew (Plasmopara viticola) on leaves and flower bunches.
- Black Pepper: Protects against foot rot (Quick wilt / Phytophthora capsici).
- Vegetables & Cucurbits: Prevents downy mildew and damping-off in nursery beds.
Spraying method, timing, and resistance management
- Preventive timing: Best applied preventively prior to infection or at the earliest warning of blight-favorable weather (cool, overcast, humid days).
- Water volume: Use 150 to 200 litres of clean water per acre for field crops and 400 to 500 litres per acre for vineyards.
- Resistance management: Do not apply more than two to three sprays per season; rotate with non-phenylamide fungicides like Dimethomorph or Cymoxanil.
- Safety instructions: Wear protective gloves and a face mask; follow label waiting periods before harvest.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the active content of Ridomil Gold?
Ridomil Gold contains Metalaxyl-M 4% + Mancozeb 64% WP, uniting a systemic phenylamide with a contact dithiocarbamate.
Which major disease does Ridomil Gold control in potato?
It is the benchmark fungicide for controlling Late Blight (Phytophthora infestans) in potato.
What is the difference between Metalaxyl and Metalaxyl-M?
Metalaxyl-M (Mefenoxam) is the purified biologically active R-enantiomer, delivering superior efficacy at lower dosage.
Can Ridomil Gold be used for downy mildew in grapes?
Yes, it provides excellent preventive and curative control against downy mildew in vineyards.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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