Multi-Site Fungicidal Mode of Action
Metiram (FRAC Group M03) functions as a non-specific multi-site enzyme inhibitor. It interferes with sulfhydryl-containing enzymes and general cellular respiration within fungal spore cells, preventing spore germination and appressorium formation. Because of its multi-site action, fungi have an extremely low risk of developing resistance.
It serves as a dependable cornerstone in disease management programs when rotated with single-site systemic fungicides.
- Potato and tomato: Early blight (Alternaria solani) and late blight (Phytophthora infestans).
- Grapes: Downy mildew (Plasmopara viticola).
- Groundnut: Tikka leaf spot disease.
- Zinc nutrition: Formulations typically contain coordinated zinc, providing a secondary micronutrient greening effect to treated foliage.
Preventative Application and Best Practices
As a contact protectant, Metiram must be applied before fungal spores infect plant tissues. Reapplication is needed after heavy rains to restore protective foliar barriers.
Ensuring uniform deposit on both upper and lower leaf surfaces creates a barrier against airborne fungal inoculation.
- Spray preventatively at the first atmospheric indication of disease-favorable weather (cool, overcast, high relative humidity).
- Use fine mist nozzles to ensure complete droplet coverage on both sides of the canopy.
- Adhere to the pre-harvest intervals and label directions published by the Central Insecticides Board.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What chemical class does Metiram fungicide belong to?
Metiram belongs to the dithiocarbamate group (FRAC Group M03), functioning as a multi-site contact protectant fungicide.
Can Metiram cure an already established fungal infection?
No, Metiram is a contact protectant that prevents new spore germination; once a fungus has penetrated internal leaf tissues, a systemic curative fungicide is required.
Does Metiram provide nutritional benefits to crops?
Yes, the zinc complex within Metiram formulations provides supplementary zinc that helps maintain deep green foliage and vigorous vegetative growth.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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