What is Thiophanate Methyl 70% WP?
Thiophanate Methyl belongs to the benzimidazole class of systemic fungicides. When applied to a plant, it is rapidly converted to carbendazim inside plant tissue, which then inhibits beta-tubulin polymerisation in fungal cells — disrupting spindle formation during cell division and preventing the fungus from reproducing. The 70% WP (wettable powder) formulation disperses easily in water for foliar spray application. As a systemic fungicide, Thiophanate Methyl moves upward through the plant's xylem after foliar application, providing protection not just on the sprayed surface but in newly emerging growth as well. This systemic movement is the key advantage over contact-only fungicides like mancozeb or copper-based products, which protect only the treated surface and wash off in rain.
Recommended Dosage for Indian Crops
The active ingredient (a.i.) dosage of Thiophanate Methyl is 500–700 grams per acre. Since Thiome is a 70% WP formulation, the product dosage is 300–400 grams of product per acre (300 g product × 70% = 210 g a.i.; 400 g product × 70% = 280 g a.i.). Dissolve the required quantity in a small amount of water first to form a paste, then dilute to the full spray volume of 150–200 litres per acre. For high-value crops such as grapes and apple where disease pressure is severe, use the higher end of the dose range (400 g/acre) and spray at shorter intervals of 10 days. For field crops like wheat and chickpea with lower disease intensity, 300 g/acre at 14-day intervals is adequate.
Target Diseases
Thiophanate Methyl 70% WP is effective against a broad range of fungal diseases. In grapes: powdery mildew (Uncinula necator) and bunch rot (Botrytis cinerea). In apple and mango: scab (Venturia spp.) and powdery mildew. In tomato and chilli: early blight (Alternaria solani), late blight (Phytophthora infestans — preventive action), and Fusarium wilt. In cucumber and other cucurbits: powdery mildew (Sphaerotheca fuliginea). In rice: sheath blight (Rhizoctonia solani) and blast (Magnaporthe oryzae). In wheat: loose smut (Ustilago tritici) when used as seed treatment, and powdery mildew in standing crop. In pulses (chickpea, pigeonpea): Fusarium wilt and Cercospora leaf spot.
Application Timing: Preventive vs Curative
Thiophanate Methyl has both preventive and curative activity, but preventive application gives the best results. For powdery mildew in grapes, begin spraying at bud burst and continue at 10–14 day intervals through the season. For early blight in tomato, start spraying at first fruit set or at the first sign of lower leaf lesions. For Botrytis in grapes and strawberry, apply before anticipated wet weather or at bunch closure stage. When used curatively — after disease symptoms are already visible — Thiophanate Methyl can arrest and reduce disease spread, but cannot reverse already-destroyed tissue. In such cases, use at the higher dose (400 g/acre) with a 10-day spray interval, and consider tank-mixing with a contact fungicide for faster surface knockdown of the pathogen.
Resistance Management
Benzimidazole resistance is a real concern with Thiophanate Methyl in intensively sprayed crops such as grapes and vegetables. Pathogens with a single nucleotide mutation in the beta-tubulin gene become fully resistant to the entire benzimidazole class. To prevent resistance development, never use Thiophanate Methyl alone as the sole fungicide for an entire season. Alternate sprays with protectant fungicides from different mode-of-action groups: mancozeb (multi-site inhibitor, FRAC M3), copper-based fungicides (multi-site, FRAC M1), or strobilurins (QoI inhibitors, FRAC 11). A standard rotation programme for grapes in India is: mancozeb → Thiophanate Methyl → copper oxychloride → Thiophanate Methyl, repeating the 4-spray cycle throughout the season.
Crops and Compatible Tank Mixes
Thiophanate Methyl 70% WP is registered for use on grapes, apple, mango, tomato, chilli, cucumber, potato, wheat, rice, chickpea, and pigeonpea in India. It can be tank-mixed with mancozeb for enhanced protectant coverage and resistance management. It is compatible with most foliar micronutrient solutions (zinc sulfate, boron) and can be mixed with insecticides like Profenofos or Emamectin Benzoate for convenience sprays, provided a jar compatibility test is done before field mixing. Do not mix with alkaline products (lime, Bordeaux mixture) as alkalinity degrades the active ingredient.
Price of Thiophanate Methyl 70% WP in India
Thiophanate Methyl 70% WP (Thiome) from No Brands is available starting from ₹320 for 250 grams. One 250 g pack treats approximately 0.6–0.8 acres of high-value crops like grapes and tomato. Branded formulations of Thiophanate Methyl 70% WP from major companies are typically priced 35–50% higher for identical active ingredient content. For a full season spray programme in grapes requiring 6–8 sprays of Thiophanate Methyl, the cost saving per acre using Thiome can exceed ₹1,000 compared to branded equivalents. No Brands supplies the same CIB-registered formulation at fair prices — no brand markup, no middleman margin.
Safety, PHI, and Precautions
The pre-harvest interval (PHI) for Thiophanate Methyl 70% WP is 7–14 days depending on the crop — check the product label for crop-specific PHI. Thiophanate Methyl has low acute toxicity to mammals but is a suspected endocrine disruptor with repeated long-term exposure; wear gloves and a mask during mixing and application. It is moderately toxic to fish and aquatic organisms — do not spray near water bodies or allow spray drift over ponds or streams. For export crops (grapes, mango), strictly observe the PHI and the maximum residue limit (MRL) for thiophanate methyl in the destination market. Store in original sealed containers in a cool, dry location away from children and food.