Bispyribac Sodium 10% SC Herbicide Uses

Bispyribac Sodium 10% SC is a selective, systemic, post-emergence herbicide from the pyrimidinyl carboxylate group, registered for use in India under the Insecticides Act, 1968. It is applied as a foliar spray to actively growing weeds in rice nurseries, transplanted rice and direct-seeded rice, and is absorbed through both the leaves and roots of target weeds. This page lists its mode of action, key benefits and the recommended crop-wise dosage as per CIB-registered labels.

Which Weeds Does This Control? (Field Identification Guide)

Not sure whether the weeds showing up in your rice nursery or field are within this herbicide's control range? This guide helps you identify the grasses, sedges and broadleaf weeds it targets so you can confirm before spraying.

Mode of Action

Bispyribac sodium belongs to the pyrimidinyl carboxylate class of herbicides and works by inhibiting acetolactate synthase (ALS), an enzyme weeds need to produce the branched-chain amino acids valine, leucine and isoleucine. Without these amino acids, protein synthesis and cell division stop in the weed's growing points. It is systemic, taken up through both leaves and roots of actively growing weeds, and moves within the plant to reach the shoot and root tips. Treated weeds typically stop growing within a few days, turn yellow-red (chlorotic) and gradually collapse over one to two weeks, while rice metabolises the herbicide fast enough to remain largely unaffected when applied at the correct crop stage and dose.

Features & Benefits

• Post-emergence, foliar-and-root-acting control that can be used across rice nurseries, transplanted rice and direct-seeded rice.
• Effective against a broad spectrum of grasses (Echinochloa spp., Ischaemum rugosum), sedges (Cyperus difformis, Cyperus iria, Fimbristylis miliacea) and several broadleaf weeds (Eclipta alba, Ludwigia parviflora, Monochoria vaginalis, Alternanthera philoxeroides, Sphenoclea zeylanica).
• Water-dispersible (SC) formulation for straightforward tank-mixing and even spray coverage.
• Narrow but well-defined application window (10–15 days after sowing/planting depending on method), allowing a single well-timed spray to control a wide weed flush.

Recommended Usage of Bispyribac Sodium 10% SC Herbicide

The table below gives the CIB-registered dose, water volume, timing and waiting period per acre, based on the official CIB-registered per-hectare rate — see the note below the table for the conversion details. Always confirm against the current product label before use.

Doses above are converted from the CIB-registered per-hectare rate (20–25 g a.i./ha; 200–250 ml formulation/ha; 300 litres water/ha) for Bispyribac Sodium 10% SC in rice. Always confirm the current pack label/CIB registration and consult your local agricultural extension office before use and before harvest.

How to Use

1. Confirm the crop stage and method (nursery, transplanted or direct-seeded rice) and apply within the labelled window (10–15 days after sowing/planting), when weeds are small and actively growing for best results.
2. Mix the required quantity of Bispyribac Sodium 10% SC into the spray tank and agitate well, since it is a suspension concentrate (SC) formulation.
3. Drain standing water from the field, or reduce it to a thin film, before spraying so the spray reaches weed foliage directly rather than being diluted by floodwater.
4. Spray uniformly using a knapsack or power sprayer fitted with a flat-fan nozzle, ensuring even coverage of weed foliage across the field.
5. Re-flood the field with a thin layer of water only after the spray has dried on the leaves, typically after a few hours, as per the current label directions.
6. Avoid spraying during strong wind or if rain is expected within a few hours, as this can reduce weed uptake and control.

Precautions & Safety

• Wear appropriate PPE — mask, gloves, goggles and full-sleeved clothing — while mixing and spraying.
• Apply only at the correct crop stage and dose given above; incorrect timing or over-dose can stress young rice.
• Do not drain the field immediately before spraying if it leaves the soil surface waterlogged, and do not re-flood too soon after spraying, as both reduce weed control.
• 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.
• Respect the 78-day waiting period (PHI) before harvest for transplanted and direct-seeded rice, and follow your local agricultural extension advice for the latest guidance.
• Bispyribac sodium is an ALS-inhibitor (Group 2) herbicide; avoid repeated, back-to-back use of the same mode of action on the same field across seasons, and rotate herbicide groups 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.

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.