Active chemical ingredient and mode of fungicidal action
Contaf contains Hexaconazole 5% EC (emulsifiable concentrate), an active systemic fungicide belonging to the triazole chemical group.
It functions as a sterol biosynthesis inhibitor (demethylation inhibitor / DMI), preventing ergosterol production in fungal cell membranes. Deprived of ergosterol, fungal hyphae cease elongation, haustoria collapse, and spore production is halted.
- Active chemical: Hexaconazole 5% EC.
- Fungicidal classification: FRAC Group 3 (Demethylation inhibitor).
- Triple action: Delivers protective, curative, and eradicative efficacy with rapid translaminar and acropetal translocation.
Target crops and approved fungal diseases
Contaf is widely registered in India across cereal crops, commercial fruits, oilseeds, and plantation crops.
It provides dependable control against both foliar and sheath fungal pathogens during vegetative and reproductive crop stages.
- Paddy (Rice): Sheath blight (Rhizoctonia solani) and blast management.
- Grapes: Powdery mildew (Uncinula necator) and black rot.
- Mango: Powdery mildew (Oidium mangiferae) on flower panicles and young flush.
- Groundnut: Tikka leaf spot (Cercospora arachidicola) and rust.
- Apple: Scab (Venturia inaequalis) and powdery mildew.
Spray recommendations and resistance management
Initiate spraying preventively upon noticing early weather conditions conducive to disease outbreaks or at the very first sign of infection.
To prevent pathogens from developing resistance to triazole chemistry, alternate Contaf with multi-site contact protectants like Mancozeb or Copper Oxychloride.
- Foliar coverage: Spray with hollow cone or fine flat fan nozzles for complete canopy wetting.
- Dose adherence: Follow label recommendations per hectare; avoid under-dosing which encourages fungal tolerance.
- Safety guidelines: Wear chemical-resistant gloves, apron, and protective face mask; adhere to recommended pre-harvest intervals (PHI).
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active ingredient in Contaf fungicide?
Contaf contains Hexaconazole 5% EC, a broad-spectrum systemic triazole fungicide.
Which fungal diseases are controlled by Contaf?
It effectively controls powdery mildew, sheath blight, rust, leaf spots, and apple scab across field and horticultural crops.
Can Contaf cure an existing fungal infection on crops?
Yes, Contaf possesses systemic curative properties that arrest fungal development inside infected plant tissues when applied at early infection stages.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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