Dual active ingredients and advanced systemic action
Ridomil Gold combines the biologically active R-enantiomer of metalaxyl (Metalaxyl-M / Mefenoxam) with the broad-spectrum multi-site protectant Mancozeb.
Metalaxyl-M provides superior systemic xylem mobility, penetrating foliage within 30 minutes to inhibit fungal RNA polymerase, while Mancozeb forms a durable protective shield on plant surfaces.
- Metalaxyl-M (4% WP): High-potency systemic phenylamide inhibiting ribosomal RNA synthesis in oomycete fungi.
- Mancozeb (64% WP): Multi-site dithiocarbamate protectant preventing spore germination on leaf surfaces.
- Rapid rainfastness: Penetrates internal leaf tissues rapidly, preventing wash-off even during sudden monsoon rains.
Target crops and approved fungal diseases
Ridomil Gold is registered for managing destructive water-mold (oomycete) pathogens across vegetables, fruit crops, and plantation agriculture.
It is a benchmark fungicide for late blight management in potato and downy mildew control in vineyards.
- Potato & Tomato: Late blight (Phytophthora infestans) affecting foliage, stems, and tubers.
- Grapes: Downy mildew (Plasmopara viticola) damaging leaves, shoots, and young berry clusters.
- Mustard: White rust (Albugo candida) and downy mildew complex.
- Black Pepper & Citrus: Foot rot (Phytophthora) through foliar spray and soil drenching.
Application methods, dilution, and safety directions
Ridomil Gold can be applied as a foliar spray, seed dressing, or soil drench around plant collars depending on the disease cycle.
Apply preventively when weather conditions favor blight development (cool temperatures, high humidity, overcast skies).
Always observe personal safety guidelines and wear protective equipment during mixing and application.
- Preventive spray: Initiate applications before disease symptoms appear during humid, cloudy weather windows.
- Soil drenching: Apply around the base of perennial crops to manage soil-borne collar rot and damping-off.
- Resistance management: Limit consecutive applications to 2-3 sprays per season, alternating with different chemical classes.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What are the active ingredients in Ridomil Gold fungicide?
Ridomil Gold contains Metalaxyl-M 4% and Mancozeb 64% in a wettable powder (WP) formulation.
How does Metalaxyl-M differ from standard metalaxyl?
Metalaxyl-M is the purified active R-enantiomer, delivering double the biological disease control potency at lower active chemical doses.
Which crops and diseases are controlled by Ridomil Gold?
It specifically controls late blight in potato/tomato, downy mildew in grapes, white rust in mustard, and foot rot in black pepper.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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