Mode of action and chemical composition
The dual chemistry of Ridomil Gold tackles fungal development at multiple biochemical sites.
- Metalaxyl-M (Mefenoxam 4%): Systemic phenylamide that inhibits fungal RNA polymerase synthesis, stopping mycelial growth inside plant vascular tissues.
- Mancozeb (64%): Multi-site contact dithiocarbamate that inactivates essential fungal sulfhydryl enzymes, blocking spore germination.
- Acropetal translocation moves the active ingredient upward into newly emerging shoots and leaves.
Target crops and critical disease management
Approved by the Central Insecticides Board & Registration Committee (CIBRC) for high-value horticultural and field crops.
- Late blight (Phytophthora infestans) in potato and tomato crops.
- Downy mildew (Plasmopara viticola) in grapes and cucurbit vegetables.
- Damping-off and foot rot (Pythium spp. and Phytophthora spp.) in vegetable nurseries and black pepper.
- White rust and downy mildew in mustard and brassica crops.
Application guidelines and resistance strategy
Following safe spraying protocols protects both crop productivity and fungicide longevity.
- Apply preventively during cloudy, humid weather when conditions favor fungal sporulation.
- Ensure thorough foliar coverage using calibrated hollow-cone nozzles and clean, neutral water.
- Limit applications to 2 to 3 sprays per season to prevent resistant biotypes from emerging.
- Strictly respect the approved pre-harvest interval (PHI) indicated on the package label.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What are the active molecules in Ridomil Gold?
Ridomil Gold contains Metalaxyl-M 4% and Mancozeb 64% in a wettable powder (WP) formulation.
Can Ridomil Gold cure established late blight?
Metalaxyl-M provides early curative action inside tissues, but best results occur when applied protectively before widespread foliar collapse.
What is the pre-harvest interval for Ridomil Gold?
The pre-harvest interval varies by crop (typically 7 to 40 days as specified on the CIBRC label); consult the packaging before harvesting.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More Crop Protection & Pesticides guides
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