Active Ingredients and Systemic-Contact Synergy
Ridomil Gold combines Metalaxyl-M (also known as Mefenoxam) with Mancozeb in a wettable powder formulation.
Metalaxyl-M translocates rapidly through plant xylem to arrest fungal RNA polymerase synthesis and stop developing mycelium, while Mancozeb forms a multi-site protective barrier on the exterior cuticle.
The active isomer Metalaxyl-M delivers superior disease control at lower chemical doses compared to racemic metalaxyl mixtures.
- Metalaxyl-M (4% WP): High-potency isomer providing upward systemic translocation and curative protection
- Mancozeb (64% WP): Multi-site surface contact protectant preventing external spore germination
- Anti-resistance design: The multi-site partner protects the single-site phenylamide active from resistant strains
Registered Diseases and Target Crops
Ridomil Gold is approved for controlling severe oomycete fungal diseases across high-value field and horticultural crops.
Preventive application ahead of humid, rainy weather conditions prevents sudden epidemic spread in vulnerable crops.
- Potato and tomato: Early and late blight (Phytophthora infestans) prevention and curative suppression
- Grapes: Controls downy mildew (Plasmopara viticola) on leaves, shoots, and fruit clusters
- Vegetables and mustard: Protects against damping-off, white rust, and downy mildew
Application Guidelines, Mixing, and Safety
Prepare a smooth slurry in clean water before pouring into the spray tank to achieve uniform wettable powder suspension.
Spray evenly across crop foliage, maintaining spray coverage of lower leaves and developing fruit surfaces while observing pre-harvest intervals.
Wear standard personal protective equipment during handling.
- Application timing: Apply preventively or at the earliest visible foliar lesions for maximum efficacy
- Sprayer maintenance: Rinse tanks and nozzles thoroughly after application to prevent nozzle clogs
- Operator safety: Wear rubber gloves, protective clothing, and a dust respirator during mixing and spraying
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What chemicals are in Syngenta Ridomil Gold?
Ridomil Gold contains Metalaxyl-M 4% + Mancozeb 64% WP, providing synergistic systemic and contact protection.
What is the advantage of Metalaxyl-M over standard metalaxyl?
Metalaxyl-M is the purified active biological isomer, providing higher fungicidal activity and systemic translocation at reduced dose rates.
Does Ridomil Gold control late blight in potatoes?
Yes, Ridomil Gold is widely recognized as one of the most effective fungicides for preventing and controlling potato late blight.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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