Bispyribac Sodium 9.5% + Penoxsulam 7.8% SC Herbicide Uses

Bispyribac Sodium 9.5% + Penoxsulam 7.8% SC is a ready-mix, selective, post-emergence rice herbicide combining bispyribac sodium (pyrimidinyl benzoate group) and penoxsulam (triazolopyrimidine sulfonamide group), registered for use in India under the Insecticides Act, 1968, formulated as a suspension concentrate (SC). It is registered for the control of grassy, broadleaf and sedge weeds such as sanwak, doob ghaas, jangli laung, dadmari, bhringraj and motha in transplanted rice (paddy). This page lists its mode of action, key benefits and the recommended dosage as per the Central Insecticides Board & Registration Committee (CIB&RC) official list of approved herbicide uses (Government of India).

Which Weeds Does This Control? (Field Identification Guide)

Not sure whether the weeds in your field match this herbicide's use case? This guide helps match weed identification to this herbicide's approved crop-wise uses.

Mode of Action

Bispyribac sodium and penoxsulam both inhibit acetolactate synthase (ALS, also called AHAS) — HRAC Group 2 (formerly Group B) — although they belong to different chemical families. They are absorbed through the leaves (and, for penoxsulam, also through the roots and from the water) and move to the growing points, where blocking ALS stops the production of the branched-chain amino acids valine, leucine and isoleucine. Weed growth stops within a few days; the growing points turn yellow and then reddish-brown, and the weeds die over about 2–3 weeks.

Both actives share the same mode of action (Group 2), so the combination does not add a second mode of action. It is used because the two partners complement each other's weed spectrum — bispyribac sodium is particularly strong on Echinochloa grasses (sanwak), while penoxsulam adds strength on broadleaf weeds and sedges — giving grass, broadleaf and sedge control in transplanted rice from one spray.

Features & Benefits

• Controls grassy weeds (sanwak — Echinochloa colona and E. crus-galli — and doob ghaas), broadleaf weeds (jangli laung, dadmari, bhringraj, gooseweed, alligator weed, pickerel weed) and sedges (motha) in transplanted rice.
• Post-emergence action, so it can be applied after the weeds have come up.
• Low dose per acre in a suspension concentrate (SC) formulation that mixes readily in water.
• Systemic action — the herbicide moves to the growing points of the weeds.
• Both components are Group 2 (ALS inhibitors) — rotate with herbicides of other groups, such as pre-emergence rice herbicides, as part of an integrated weed-management program.

Recommended Usage of Bispyribac Sodium 9.5% + Penoxsulam 7.8% SC Herbicide

The table below gives the recommended dose, water volume and waiting period per acre for each crop, converted from the CIB&RC-registered per-hectare rate — see the note below the table for conversion details. Always spray in the recommended water volume for uniform coverage, and confirm against the current product label before use.

Figures above are converted from the CIB&RC-registered per-hectare rate (1 ha ≈ 2.47 acres): Transplanted rice (paddy) — 23.75 + 19.5 g a.i./ha (bispyribac sodium + penoxsulam), 250 ml formulation/ha, 500 L water/ha, waiting period 78 days. Always confirm the current product label before use.

How to Use

1. Identify the weeds in your paddy field using the guide above and confirm that they match the approved uses.
2. Spray post-emergence, when the weeds are young (generally at the 2–4 leaf stage) and actively growing; follow the product label for the exact timing after transplanting.
3. Drain the standing water from the field before spraying so that the weeds are exposed, and re-flood the field as advised on the product label (generally within 2–3 days of spraying).
4. Shake the container well, add the measured dose to a half-filled spray tank and top up with clean water while stirring.
5. Use a knapsack sprayer with a flat-fan nozzle and cover the weeds uniformly; do not overlap spray swaths.
6. Spray in calm, clear weather when no rain is expected for several hours.

Precautions & Safety

• Respect the 78-day waiting period (PHI) between spraying and harvest of the paddy crop.
• Use only in transplanted rice as registered by CIB&RC, and avoid spray drift onto neighbouring sensitive crops.
• Do not let water from the treated field drain into ponds, fish tanks or channels used for other crops soon after spraying.
• Both components belong to herbicide Group 2; do not rely on this or other Group 2 herbicides alone season after season — rotate or combine with other groups and weed-control methods to slow resistance development.
• Wear appropriate PPE — mask, gloves, goggles and full-sleeved clothing — while mixing and spraying, and avoid inhaling the spray mist.
• Do not let spray, spray-tank washings or leftover solution reach ponds, canals, streams or drinking-water sources.
• 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 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.