Thiophanate Methyl 70% WP Fungicide Uses

Thiophanate Methyl 70% WP is a systemic, broad-spectrum fungicide from the benzimidazole (thiophanate) chemical class, registered for use in India under the Insecticides Act, 1968 and sold under various trade names including Biostadt's Roko, Sumitomo's Buddi, IIL's Prism and others. It carries label recommendations across cereals (paddy), cash crops (cotton), fruit crops (grapes, apple, papaya) and vegetables (tomato, bottle gourd/cucurbits), used as a foliar spray against blast, sheath blight/rot, scab, powdery mildew, anthracnose and fruit rot. Thiophanate methyl remains 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 per manufacturer labels.

Mode of Action

Thiophanate methyl is a systemic fungicide that, once absorbed into the plant, is converted into carbendazim (a methyl benzimidazole carbamate, or MBC), which is the actual fungicidally active molecule. Carbendazim acts by binding to beta-tubulin, a structural protein needed to build the mitotic spindle during fungal cell division, which blocks fungal mitosis and halts the pathogen's growth and spread. Because thiophanate methyl is quickly absorbed and translocated within the plant's vascular system, it provides both a preventive barrier against new infection and a curative effect against early-stage infection already present in the tissue, and continues to protect new growth that emerges after spraying. As it shares its active breakdown product with carbendazim, it belongs to the same benzimidazole resistance-management group as carbendazim-based fungicides — see also Carbendazim 50% WP Fungicide Uses and Carbendazim 46.27% SC Fungicide Uses for reference.

Features & Benefits

• Broad-spectrum, systemic control of major fungal diseases — blast, sheath blight/rot, scab, powdery mildew, anthracnose and fruit/grain discolouration — across cereals, cotton, fruit and vegetable crops.
• Dual preventive and curative action, converting to carbendazim inside the plant for lasting disease suppression.
• Quick absorption and translocation gives extended protection of around 12–15 days per application in many crops.
• Versatile application methods — foliar spray, seed treatment, rhizome/tuber dip and soil drenching — depending on the crop and target disease.

Recommended Usage of Thiophanate Methyl 70% WP 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 Thiophanate Methyl 70% WP, 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. Make a thin paste of the required quantity of Thiophanate Methyl 70% WP in a small amount of water, then dilute this gradually into the full spray tank volume while stirring continuously so the wettable powder 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 increases the risk of 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 (avoid rotating only with carbendazim/other benzimidazoles, since they share the same resistance 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, and avoid inhaling the wettable powder dust while opening the pack.
• Do a small jar-compatibility test before tank-mixing with other agrochemicals, and avoid mixing with strongly alkaline materials or copper-based fungicides.
• 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.
• Because thiophanate methyl converts to carbendazim in the plant, resistance risk and management practices are shared with carbendazim/benzimidazole-group fungicides; avoid repeated, back-to-back applications on the same crop/disease and rotate with a fungicide from a genuinely different mode-of-action group.
• Respect the waiting period (PHI) listed for each crop above before harvesting, and follow your local agricultural extension advice for the latest guidance.
• 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.