Carbendazim 50% WP Fungicide Uses

Carbendazim 50% WP is a broad-spectrum, systemic fungicide from the benzimidazole (carbamate) chemical class, registered for use in India under the Insecticides Act, 1968 and sold under numerous trade names by manufacturers including BASF/Crystal (Bavistin), Indofil, Dhanuka, Katyayani, UPL and others. It carries a wide label covering cereals (paddy, wheat, barley), pulses and oilseeds (moong, cowpea, groundnut, peas, cluster beans), vegetables (brinjal, cucurbits), fruits (grapes, apple, ber) and fibre/cash crops (cotton, jute, sugar beet, tobacco), used both as a foliar spray against leaf spots, blights, powdery mildew and anthracnose, and as a low-dose seed treatment against seed-borne diseases such as loose smut. Carbendazim remains legally registered and sold in India; note that it was included, along with several other older molecules, in a 2020 government list proposed for further regulatory review, though no ban or additional restriction has since been notified — always confirm the current pack label before use. This page lists its mode of action, key benefits and the complete crop-wise recommended dosage as per the approved label.

Mode of Action

Carbendazim is a systemic, translocated fungicide that acts by binding to beta-tubulin, a structural protein essential for building the mitotic spindle during cell division in fungi. By disrupting spindle-microtubule assembly, it blocks mitosis (nuclear division) in the fungal pathogen, halting its growth, sporulation and spread. Because it interferes with a basic cellular process rather than a single surface enzyme, it provides both protective action — preventing new infection when applied ahead of disease onset — and curative/eradicant action against early-stage infections already established in plant tissue. After a foliar spray or seed treatment, carbendazim is absorbed and translocated within the plant's vascular system, so it continues protecting new growth for some time after application; this systemic movement is also why it works well as a seed dressing against seed-borne and early seedling infections such as loose smut and seedling blight.

Features & Benefits

• Broad-spectrum control of a wide range of fungal diseases — leaf spots, blights, powdery mildew, anthracnose, smuts and fruit/set rots — across cereals, pulses, oilseeds, vegetables and fruit crops.
• True systemic movement within the plant gives longer-lasting protection than purely contact fungicides and continues to protect leaf growth that emerges after spraying.
• Dual protective plus curative (eradicant) action, so it can arrest early infections already present in the plant in addition to preventing new ones.
• Effective, low-dose seed treatment option (2 g per kg seed) against seed-borne diseases such as loose smut of wheat/barley and seedling blight of jute, protecting the crop from the point of germination onward.

Recommended Usage of Carbendazim 50% WP Fungicide

The table below gives the recommended dose and water volume per acre for each crop and target disease, based on the label data reproduced consistently across TNAU's official fungicide recommendations and multiple manufacturer labels (Bavistin, Dhanustin, SuperStin and others). Always spray in the recommended water volume for uniform coverage, and confirm against the current product label before use.

Seed Treatment Use

Carbendazim 50% WP is also widely used as a seed dressing against seed-borne and early seedling diseases. Mix the recommended quantity into a small volume of water (about 1 litre of water per 10 kg seed) to make a wet slurry, coat the seed evenly, and dry treated seed in shade before sowing.

For cassava/tapioca (control of set rot), planting setts may instead be dip-treated in a solution of approximately 1 g product per litre of water before planting, as per TNAU and manufacturer label recommendations.

Doses above are converted from the official label rate, which is expressed per hectare (1 ha ≈ 2.47 acres), rounded to practical spray-tank quantities, and cross-checked against TNAU's fungicide recommendations and multiple independent manufacturer labels (Bavistin, Dhanustin, SuperStin). None of the label sources checked state a numeric waiting period (PHI) in days for Carbendazim 50% WP on these crops, so this has been marked "Not specified on label" rather than estimated. Always confirm the current pack label/CIB registration and consult your local agricultural extension office for the latest PHI guidance before harvest. Orchard/tree crop doses (apple, ber, walnut, rose) are given as a dilution rate per tree rather than per acre, since tree spacing and canopy size vary widely.

How to Use

1. Identify your crop and target disease from the table above, and confirm the correct dose per acre — the foliar spray dose and water volume differ for each crop and disease.
2. For a foliar spray, first make a thin paste of the required quantity of Carbendazim 50% 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 and does not settle or clog the nozzle.
3. For seed treatment, mix the recommended dose (2 g per kg seed) into about 1 litre of water per 10 kg seed to form an even, wet slurry; coat the seed thoroughly, then dry it in shade before sowing — do not store wet-treated seed for long periods.
4. 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; avoid spraying in hot, windy conditions or when rain is expected within a few hours, as this reduces efficacy and increases drift/runoff.
5. Repeat sprays at 10–15 day intervals if disease pressure continues or as advised by local agricultural extension, 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, and avoid inhaling the wettable powder dust while opening the pack.
• Carbendazim 50% WP is broadly compatible with most commonly used insecticides and fungicides, but avoid tank-mixing with strongly alkaline materials (such as lime or Bordeaux mixture) or copper-based fungicides, which can reduce its stability and effectiveness; always do a small jar-compatibility test before mixing with an unfamiliar product.
• 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.
• A specific waiting period (PHI) is not stated on the standard label for most crops — as a safe practice, do not harvest food crops immediately after spraying, and follow your local agricultural extension advice on the appropriate interval before harvest.
• Carbendazim resistance is a well-documented, real-world issue in several fungal pathogens (such as Fusarium, Sclerotinia and Botrytis species) because of its 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.
• 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.