Active ingredients and complementary modes of action
- Metalaxyl-M (Mefenoxam): Systemic phenylamide compound that is rapidly absorbed by green tissues and translocated acropetally, inhibiting fungal RNA synthesis.
- Mancozeb: Broad-spectrum multi-site protectant that forms a persistent protective film on plant leaves, disrupting multiple enzymes in fungal spores upon contact.
- The combination ensures rapid internal curative action alongside prolonged surface protection against reinfection.
Target plant diseases and major crops
- Late blight (Phytophthora infestans) in potato and tomato crops.
- Downy mildew (Plasmopara viticola) in grapevine vineyards and cucurbit vegetables.
- Damping-off and foot rot in vegetable nursery seedbeds and black pepper vines.
- Downy mildew in pearl millet (bajra) and damping-off in tobacco seedlings.
Application timing and safe usage guidelines
- Apply preventively at the onset of disease-favorable weather (high humidity and moderate temperatures) or at the first sign of foliage spotting.
- Strictly follow the dilution rates and spray volumes approved by the Central Insecticides Board & Registration Committee (CIBRC) on the product container label.
- Observe the mandatory pre-harvest interval (PHI) before picking produce, and wear standard protective gear while handling the concentrate.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What are the active ingredients in Ridomil Gold?
It contains Metalaxyl-M (4% w/w) and Mancozeb (64% w/w) as a wettable powder (WP).
Which diseases does Ridomil Gold control?
It primarily controls late blight in potatoes and tomatoes, and downy mildew in grapes and cucurbits.
Is Ridomil Gold a systemic or contact fungicide?
It is a dual-action fungicide containing systemic Metalaxyl-M and protectant contact Mancozeb.
When should Ridomil Gold be applied for best results?
Apply preventively during cool, humid weather or immediately upon seeing initial disease symptoms.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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