DMI Triazole Chemistry and Spectrum of Disease Control
Hexaconazole operates as a demethylation inhibitor (DMI), blocking the C-14 demethylase enzyme in fungal ergosterol biosynthesis. The resulting disruption of fungal cell membrane integrity halts vegetative hyphal extension and suppresses spore production.
Its strong acropetal xylem systemic movement distributes the active chemical upward into newly emerging shoots and leaves.
- Paddy: Sheath blight (Rhizoctonia solani) and sheath rot.
- Grapevines & mango: Powdery mildew (Uncinula necator and Oidium mangiferae).
- Groundnut: Tikka leaf spot disease.
- Apple: Apple scab and powdery mildew.
- Curative action: Halts established early fungal mycelial colonization within plant tissues.
Application Standards and Resistance Management
Hexaconazole delivers optimal yield protection when applied preventatively or at the earliest sign of disease symptom appearance.
Rotating with multi-site contact protectant fungicides ensures long-lasting efficacy against variable fungal populations.
- Calibrate spray equipment using hollow cone nozzles to achieve thorough canopy coverage.
- In paddy, direct the spray nozzle toward the base of rice hills where sheath blight lesions initiate.
- Observe the registered pre-harvest intervals (PHI) to comply with maximum residue limits.
- Wear personal protective gear including gloves, goggles, and face mask during measuring and spraying.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active ingredient in Hexaconazole 5% EC?
It contains Hexaconazole at 5% concentration in an emulsifiable concentrate, belonging to the systemic triazole fungicide group.
How does Hexaconazole control sheath blight in paddy?
Its systemic xylem mobility reaches lower rice tillers where Rhizoctonia lesions develop, halting fungal growth and preventing upward sheath spread.
Does Hexaconazole provide curative action against fungal infections?
Yes, Hexaconazole offers both preventative barrier properties and systemic curative activity against established early infections.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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