Tebuconazole 38.39% SC Fungicide Uses

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Tebuconazole 38.39% w/w SC is a systemic, broad-spectrum fungicide from the triazole chemical group, registered for use in India under the Insecticides Act, 1968, formulated as a suspension concentrate (SC). It is registered for the control of yellow rust and powdery mildew in wheat, Alternaria leaf spot in cabbage, powdery mildew in grape, purple blotch and Stemphylium blight in onion, sheath blight in rice, tikka leaf spot in groundnut, powdery mildew and Cercospora leaf spot in chilli, Alternaria/Cercospora/Myrothecium leaf spots in soybean, early blight/anthracnose in tomato, leaf/fruit spot/anthracnose in pomegranate, leaf rust in coffee, and Marssonina leaf blotch (premature leaf fall) in apple. This page lists its mode of action, key benefits and the complete crop-wise recommended dosage as per the Central Insecticides Board & Registration Committee's (CIB&RC) official list of approved fungicide uses.

Which Problem Is This For? (Symptom Guide)

Not sure whether what you're seeing in the field matches this fungicide's use case? This guide helps match symptoms to this fungicide's approved crop-wise uses.

Crop Other Names What You'll See in the Field
Wheat Yellow rust (पीला रतुआ), Powdery mildew. Bright yellow, powdery pustules arranged in narrow stripes running along the leaf veins, most visible on the upper leaf surface (yellow rust); powdery mildew shows as a white powdery coating on leaves and stems that reduces grain filling.
Cabbage Alternaria leaf spot. Small, dark brown to black spots with concentric rings on leaves that enlarge over time, often with a yellow halo; severely affected leaves turn papery and tear, and spots can also appear on the head.
Grape Powdery mildew. White to greyish powdery fungal growth on leaves, shoots and berries; affected berries crack, show a net-like scarring, and can stop growing or drop, while heavily coated leaves turn brittle and curl.
Onion Purple blotch (पर्पल ब्लॉच/बैंगनी धब्बा), Stemphylium blight. Small, water-soaked, whitish lesions on leaves that enlarge into purplish-brown blotches with concentric zonation (purple blotch), often girdling and collapsing the leaf; Stemphylium blight causes similar tan-to-brown lesions that can be hard to tell apart in the field and often occurs together with purple blotch.
Rice (Paddy) Sheath blight (शीथ ब्लाइट/आवरण झुलसा). Irregular, greenish-grey, water-soaked lesions with a purplish-brown border on the leaf sheath near the waterline, enlarging and merging to form a banded pattern that spreads up the plant; severely affected tillers lodge and panicles fail to fill properly.
Groundnut Tikka leaf spot (टिक्का रोग). Small, circular, dark brown to black spots on leaves, often with a yellow halo, that multiply and cause premature defoliation, reducing pod filling and yield.
Chilli Powdery mildew, Cercospora leaf spot. White powdery coating on the underside of leaves that causes yellowing and early leaf drop (powdery mildew); Cercospora leaf spot shows as small, circular spots with grey centres and dark margins, giving a "frog-eye" appearance, that enlarge and merge on heavily infected leaves.
Soybean Leaf spots (Alternaria, Cercospora & Myrothecium). Multiple leaf-spot diseases with overlapping symptoms — small, irregular brown-to-black spots that enlarge, often with concentric rings or a yellow halo, causing premature yellowing and defoliation under humid conditions.
Tomato Early blight, Anthracnose. Early blight shows as dark, concentric-ringed ("target board") spots on older leaves that enlarge and cause yellowing and leaf drop; anthracnose causes sunken, water-soaked circular spots on ripening fruit that enlarge with concentric rings and pinkish spore masses in humid weather.
Pomegranate Leaf & fruit spot, Anthracnose. Small, circular, brown to black spots on leaves that may cause premature leaf fall, and similar dark, sunken spots on fruit that can enlarge and lead to fruit cracking or rot in humid weather.
Coffee Leaf rust. Orange to yellowish-brown powdery pustules on the underside of leaves, often in irregular patches; heavily infected leaves yellow and drop early, weakening the bush and reducing bean yield.
Apple Marssonina leaf blotch (premature leaf fall). Irregular, dark greenish-black blotches on the upper leaf surface that enlarge and merge, turning leaves yellow around the blotches; heavily affected leaves drop well before normal autumn fall, weakening the tree over successive seasons.

Mode of Action

Tebuconazole belongs to the triazole group of fungicides, part of the wider demethylation-inhibitor (DMI) class — FRAC Group 3. It is systemic and translocated acropetally (upward) within the plant through the xylem. It works by inhibiting the biosynthesis of ergosterol, an essential structural component of fungal cell membranes, by blocking the C-14 demethylase enzyme in the ergosterol production pathway. Without adequate ergosterol, developing fungal cell membranes become structurally unstable, which halts fungal growth, sporulation and further disease spread. Its systemic movement gives protective action ahead of infection as well as early-curative action against infections already established in plant tissue, and it continues protecting new growth that emerges after spraying.

Features & Benefits

  • Broad-spectrum control across rust, powdery mildew, leaf-spot and blight diseases on a wide range of field, plantation and horticultural crops from a single fungicide.
  • True systemic movement gives protective action plus early-curative activity against infections already present in the plant.
  • Systemic uptake means the fungicide continues protecting new growth that emerges after spraying, giving longer-lasting control than purely contact fungicides.
  • Higher-strength (38.39% w/w) suspension concentrate (SC) formulation that mixes readily into a stable spray solution for uniform tank application.

Recommended Usage of Tebuconazole 38.39% SC Fungicide

The table below gives the recommended dose and water volume per acre for each crop and target disease, based on the Central Insecticides Board & Registration Committee's (CIB&RC) official list of approved fungicide uses (Government of India) — see the note below the table for the per-hectare-to-per-acre conversion. Always spray in the recommended water volume for uniform coverage, and confirm against the current product label before use.

Crop Target Disease Dose per Acre Water Volume per Acre Waiting Period (PHI)
Wheat Yellow rust, Powdery mildew ~245 ml ~150–200 litres 5 days
Cabbage Alternaria leaf spot ~245 ml ~150–200 litres 5 days
Grape Powdery mildew ~200–225 ml ~150–200 litres 60 days
Onion Purple blotch, Stemphylium blight ~180–200 ml ~150–200 litres 43 days
Rice (Paddy) Sheath blight ~175–200 ml ~150–200 litres 35 days
Groundnut Tikka leaf spot ~175–200 ml ~150–200 litres 32 days
Chilli Powdery mildew, Cercospora leaf spot ~180–200 ml ~150–200 litres 5 days
Soybean Leaf spots (Alternaria, Cercospora & Myrothecium) ~200–245 ml ~200 litres 28 days
Tomato Early blight, Anthracnose ~250 ml ~200 litres 5 days
Pomegranate Leaf & fruit spot, Anthracnose ~170–175 ml ~200 litres 59 days
Coffee Leaf rust 7.5 ml per 10 litres of water* As required to cover the bush* 26 days
Apple Marssonina leaf blotch (premature leaf fall) 7.5 ml per 10 litres of water* As required, depending on tree size* 30 days

Doses above are converted from the official rate published in the CIB&RC's list of approved fungicide uses (Government of India), which states the rate in grams a.i./millilitres formulation per hectare; converted here to a practical per-acre spray-tank quantity (1 ha ≈ 2.47 acres) and rounded. *The coffee and apple doses are the CIB&RC source's own figures given directly — for these two crops, the source expresses the rate as a fixed mixing concentration (7.5 ml per 10 litres of water) rather than a per-hectare/per-acre area rate, and the spray volume itself is not fixed but depends on bush/tree size and the equipment used, so it cannot be converted into a per-acre ml figure the way the other rows above are; mix at this concentration and spray to cover the plant. Always confirm the current dose on your specific product's label, and consult your local agricultural extension office if in doubt.

How to Use

  1. Identify your crop and target disease from the table above, and confirm the correct dose per acre and water volume.
  2. Measure the required quantity of Tebuconazole 38.39% SC and add it to the spray tank partly filled with water, then top up to the required volume while agitating.
  3. Apply as a fine, uniform spray covering the entire crop canopy, including the underside of leaves and, for sheath blight in rice, the base of the plant near the waterline.
  4. Begin spraying at the first appearance of disease symptoms, or preventively ahead of expected disease pressure during humid, favourable weather.
  5. Repeat sprays at 10–15 day intervals if disease pressure continues, or as advised by local agricultural extension, and rotate with fungicides from a different FRAC group to manage the risk of resistance.

Precautions & Safety

  • Wear appropriate PPE — mask/respirator, gloves, goggles and full-sleeved clothing — while mixing and spraying, and avoid inhaling spray mist.
  • Resistance to triazole (DMI-class) fungicides, including tebuconazole, is a well-documented, real-world concern in several fungal pathogen groups worldwide because of their single-site mode of action; avoid repeated, back-to-back applications on the same crop/disease, and rotate or tank-mix with fungicides from a different resistance group as part of a resistance-management program.
  • Follow the recommended dose strictly — both underdosing (poor disease control and greater risk of resistant pathogen populations developing) and overdosing reduce field performance and increase cost.
  • Respect the waiting period (PHI) given in the table above and on the current product label before harvesting the treated crop.
  • Store in the original, tightly closed container in a cool, dry place away from direct sunlight, food and feed, and out of reach of children and livestock.
  • 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.

Brand names mentioned on this page are registered trademarks of their respective owners and are referenced here for identification purposes only; FarmMate is not affiliated with or endorsed by these brands. This page is for general information only — always consult your local agricultural extension office and confirm the current product label before use.

Disclaimer

The dosage and usage information on this page is based on the Central Insecticides Board & Registration Committee (CIB&RC), Government of India, document "Major Uses of Pesticides" (registered under the Insecticides Act, 1968; updated up to 31.03.2026). As stated in that document, it has been compiled on the basis of available information for guidance and not for legal purposes. Likewise, this page is for general information and guidance only; it is not intended for any legal purpose and has no legal validity.

Before using any product, always read and follow the instructions on its label and leaflet. If in doubt, consult your local agricultural extension officer.

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