Carbendazim 25% + Mancozeb 50% WS Fungicide Uses

Carbendazim 25% + Mancozeb 50% WS is a combination seed-treatment fungicide that pairs carbendazim, a systemic benzimidazole fungicide, with mancozeb, a multi-site contact fungicide of the dithiocarbamate group. It is registered for use in India under the Insecticides Act, 1968, formulated as a water-dispersible powder for slurry seed treatment (WS). It is registered for treating the seed of groundnut, potato, paddy, wheat, black gram, Bengal gram, soybean, onion and maize against seed-borne and soil-borne diseases such as collar rot, root rot, dry root rot, loose smut, seed rot, seedling blight and damping-off. This page lists its mode of action, key benefits and the recommended seed-treatment dose as per the Central Insecticides Board & Registration Committee (CIB&RC) official list of approved fungicide uses (Government of India).

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.

Mode of Action

This seed treatment combines two fungicides with different modes of action. Carbendazim belongs to the benzimidazole (MBC) group — FRAC Group 1; it binds to beta-tubulin and stops fungal cell division, and being systemic it is absorbed by the germinating seed and moves into the young seedling, acting against fungi carried inside the seed (such as loose smut of wheat) and against early infections. Mancozeb is a dithiocarbamate — FRAC Group M03 (multi-site contact activity); it stays as a protective coat on the seed surface and inactivates many fungal enzymes at once, killing surface-borne spores and soil fungi that attack the seed. The combination is used because the systemic and contact components protect the seed both inside and outside, and because pairing a single-site fungicide (carbendazim) with a multi-site partner (mancozeb) reduces the risk of fungi developing resistance.

Features & Benefits

• Two modes of action in one product — systemic (carbendazim, FRAC 1) and multi-site contact (mancozeb, FRAC M03).
• Protects the seed and young seedling against seed-borne and early soil-borne diseases such as collar rot, root rot, seed rot, damping-off and loose smut.
• Registered across cereals, pulses, oilseeds and vegetables — groundnut, potato, paddy, wheat, black gram, Bengal gram, soybean, onion and maize.
• Seed treatment uses a small quantity of product per kg of seed and puts the protection exactly where the early infection starts.
• The multi-site mancozeb component helps reduce the risk of resistance developing to carbendazim.

Recommended Usage of Carbendazim 25% + Mancozeb 50% WS Fungicide

The table below gives the recommended seed-treatment dose, slurry water and waiting period for each crop, as registered by CIB&RC per 10 kg of seed — see the note below the table for details. Always confirm against the current product label before use.

This is a seed treatment, so doses are given per 10 kg of seed exactly as listed by CIB&RC, not per acre: groundnut, paddy and wheat (7.5+15.0) to (8.75+17.5) g a.i. per 10 kg seed, i.e. 30–35 g formulation; black gram, Bengal gram, soybean, onion and maize 7.5+15 g a.i., i.e. 30 g formulation; potato (1.5+3.0) to (1.75+3.5) g a.i. per 10 kg seed, i.e. 6–7 g formulation per 10 kg seed. CIB gives no waiting period (PHI) for these seed-treatment uses. *CIB lists a water figure of 0.1 for most crops, 2 for potato and 10 for onion without stating the unit, so it is not converted here — use just enough water to make a smooth slurry that coats the seed evenly, as directed on your product's label. Always confirm the current dose on your specific product's label before use.

How to Use

1. Identify your crop and the target disease from the tables above, and weigh the seed to be treated.
2. Weigh out the product at the rate given for your crop (per 10 kg of seed) and mix it with a small quantity of water to make a smooth slurry.
3. Put the seed in a seed-treating drum, a clean container or on a plastic sheet, add the slurry and mix thoroughly until every seed is evenly coated.
4. Dry the treated seed in the shade, spread out in a thin layer, and sow it the same day or as soon as possible after treatment.
5. If the seed is also to be treated with an insecticide or a biological inoculant (such as Rhizobium culture), follow the sequence and compatibility advice on the product label or from your local agricultural extension office.

Precautions & Safety

• Wear gloves, a mask and full-sleeved clothing while treating seed, and avoid inhaling the powder; do not mix seed with bare hands.
• Treated seed is for sowing only — never use it for human or animal consumption, and keep it away from poultry and livestock.
• Do not store treated seed together with food grains; label bags of treated seed clearly.
• CIB gives no waiting period (PHI) for these seed-treatment uses because the product is applied to the seed before sowing.
• Bury or safely dispose of leftover treated seed and empty packets away from water sources; do not let rinse water reach ponds or streams.
• 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, 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.