Tebuconazole 25.9% EC Fungicide Uses

Tebuconazole 25.9% EC is a systemic, broad-spectrum fungicide from the triazole (DMI - demethylation inhibitor) chemical class, registered for use in India under the Insecticides Act, 1968 and sold under various trade names by manufacturers including Bayer (Folicur), Godrej (Lark), Parijat (Indazole), ADAMA (Orius) and others. It carries label recommendations across cereals (paddy/rice), pulses, oilseeds (groundnut), vegetables (chilli, onion, tomato) and fruit crops, used as a foliar spray against rusts, blights, blotches, fruit rot and leaf spots. Tebuconazole is legally registered and sold in India; always confirm the current pack label before use. This page lists its mode of action, key benefits and the recommended crop-wise dosage as commonly listed on manufacturer labels.

Mode of Action

Tebuconazole belongs to the triazole group of fungicides, which act by inhibiting a fungal enzyme (C14-demethylase) that is essential for building ergosterol, the main sterol used to construct fungal cell membranes. By blocking ergosterol synthesis, the fungus is unable to build normal, functional cell membranes, which halts its growth and reproduction. Because this mechanism disrupts a basic building block of the fungal cell rather than a surface symptom, tebuconazole provides both protective action against new infection and curative action against early-stage infection already present in the plant. It is absorbed by the leaf tissue and moves acropetally (upward) within the plant, giving longer-lasting protection to new growth after spraying. Like several other triazole fungicides, tebuconazole also has a mild plant growth-regulatory (phytotonic) effect, which is often reported by users as improved greening and better fruit/grain set alongside disease control.

Features & Benefits

• Broad-spectrum, systemic control of major fungal diseases — blast, sheath blight, rust, fruit rot, powdery mildew and leaf/pod spots — across cereals, pulses, oilseeds and vegetable crops.
• Dual preventive and curative action, so it can be used both ahead of expected disease pressure and to arrest an infection that has already started.
• True systemic movement gives extended protection to new leaf growth that emerges after spraying, reducing the need for very frequent reapplication.
• Reported phytotonic (plant health/greening) benefit in addition to disease control, common to triazole-group fungicides.

Recommended Usage of Tebuconazole 25.9% EC Fungicide

The table below gives the commonly recommended dose and water volume per acre for each crop and target disease, as listed on manufacturer labels for this active ingredient. Always spray in the recommended water volume for uniform coverage, and confirm against the current product label before use.

Doses above are the commonly listed formulation-label rates for Tebuconazole 25.9% EC, rounded to practical spray-tank quantities. Always confirm the current pack label/CIB registration and consult your local agricultural extension office for the latest guidance before use and before harvest.

How to Use

1. Identify your crop and target disease from the table above, and confirm the correct dose per acre for that crop.
2. Measure the required quantity of Tebuconazole 25.9% EC and pre-mix it in a small quantity of water, then add this to the spray tank and top up to the full water volume while stirring, so the emulsifiable concentrate disperses evenly.
3. Spray using a knapsack or power sprayer fitted with a flat-fan or hollow-cone nozzle for uniform leaf coverage, preferably during the early morning or late evening.
4. Avoid spraying in hot, windy conditions or when rain is expected within a few hours, as this reduces efficacy and can cause spray drift or wash-off.
5. Repeat sprays at 10–15 day intervals if disease pressure continues, alternating with a fungicide from a different mode-of-action group to reduce the risk of resistance development, and always respect the waiting period before harvest.

Precautions & Safety

• Wear appropriate PPE — mask/respirator, gloves, goggles and full-sleeved clothing — while mixing and spraying.
• Do a small jar-compatibility test before tank-mixing with other agrochemicals, and avoid mixing with strongly alkaline materials.
• Store in the original, tightly closed container in a cool, dry place away from direct sunlight, food, feed and out of reach of children and livestock.
• Respect the waiting period (PHI) listed for each crop above before harvesting, and follow your local agricultural extension advice for the latest guidance.
• Triazole fungicides share a single-site mode of action; avoid repeated, back-to-back applications on the same crop/disease and rotate with a fungicide from a different resistance group as part of a resistance-management program.
• Wash hands, face and any exposed skin thoroughly with soap and water after handling or spraying, and change out of contaminated clothing before eating, drinking or smoking.