Active Ingredients and Formulation
Ridomil Gold contains metalaxyl-M (mefenoxam 4% w/w) and mancozeb (64% w/w) formulated as a wettable powder (WP) or water-dispersible granule (WG).
The active R-enantiomer mefenoxam provides systemic internal inhibition of fungal RNA polymerase, while mancozeb forms a multi-site protective barrier on the exterior foliage.
- Systemic Component: Metalaxyl-M moves acropetally, protecting emerging foliage and internal stems
- Contact Component: Mancozeb prevents zoospore germination on wet leaf surfaces
- Rainfastness: Fast foliar absorption ensures protection even when rain occurs shortly after application
Standard Dilution Rates and Crop Applications
For knapsack sprayers, dissolve 20 to 25 grams of Ridomil Gold in a standard 10-liter bucket before pouring into a 15-liter spray tank with clean water.
Always refer to the official CIBRC approved label on the container for crop-specific dosage calibrations.
- Potato Late Blight: 2.0 to 2.5 g per liter (approx. 1 kg per acre in 400 to 500 liters of water)
- Grapes Downy Mildew: 1.5 to 2.0 g per liter of water during active vine growth
- Tomato Early and Late Blight: 2.0 g per liter applied upon first blight detection
- Black Pepper Phytophthora Foot Rot: Soil drenching around vine bases at recommended label dilution
Resistance Management and Application Safeguards
Oomycete fungi, particularly Phytophthora infestans and Plasmopara viticola, can develop resistance if systemic phenylamides are used repeatedly.
Limit Ridomil Gold to two to three applications per crop cycle, alternating with copper-based or dithiocarbamate protectants.
- Preventive Timing: Spray at first environmental warning (cool temperatures with prolonged leaf wetness)
- Pre-Harvest Interval: Observe designated withholding periods before harvesting fruits or tubers
- Protective Gear: Use face mask, rubber gloves, and eye protection during chemical handling
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 is the standard Ridomil Gold dosage per 15-liter spray pump?
The general recommendation is 30 to 37.5 grams per 15-liter pump (at 2 to 2.5 g per liter) depending on crop and disease severity.
Can Ridomil Gold cure existing severe potato blight?
It has curative activity in early infection stages, but severely destroyed foliage cannot be revived; preventive application is far more effective.
What diseases does Ridomil Gold control?
It specifically targets oomycete pathogens causing late blight, downy mildew, damping-off, and Phytophthora foot rots.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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