Active ingredient and biochemical mode of action
Bispyribac sodium belongs to the pyrimidinyl carboxy chemical class.
Mode of action details:
- Active ingredient: Bispyribac Sodium 10% SC (Suspension Concentrate).
- Enzyme inhibition: Inhibits the plant acetolactate synthase (ALS) enzyme, shutting down the biosynthesis of essential branched-chain amino acids (valine, leucine, and isoleucine).
- Selective safety: Rice metabolizes the active molecule rapidly into harmless breakdown products, whereas susceptible weed species lack this metabolic pathway.
- Systemic uptake: Rapidly absorbed through weed foliage and roots, translocating throughout the plant within hours of application.
Target weed spectrum and application window
The herbicide controls the most competitive weed species infesting paddy fields.
Key target weeds and timing:
- Grassy weeds: Echinochloa crus-galli (barnyard grass / sanwak) and Echinochloa colona (jungle rice).
- Broadleaf weeds and sedges: Eclipta alba, Ludwigia parviflora, and Cyperus species.
- Application window: Apply 15 to 25 days after transplanting or direct sowing when weeds are at the active 2 to 4 leaf stage.
- Water management: Drain standing water from the field prior to spraying so weeds are fully exposed; re-flood the field 48 hours after application and hold shallow water for 5 to 7 days.
Spray equipment, surfactant and safety precautions
Apply using a knapsack sprayer fitted with a flat-fan or flood-jet nozzle using recommended water dilution (typically 120 to 150 litres per acre). Always mix with the manufacturer's recommended adjuvant to maximize leaf wetting and penetration. Applicators must wear standard personal protective equipment (PPE).
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the active ingredient in Nominee Gold herbicide?
The active ingredient is Bispyribac Sodium 10% SC, a selective post-emergence herbicide for rice.
Which major weed in paddy does Bispyribac Sodium control?
It is widely used to control Echinochloa species (barnyard grass / sanwak), the most destructive grassy weed in rice fields.
Why should standing water be drained before applying this herbicide?
Standing water covers weed foliage; draining water exposes weed leaves to the spray mist, ensuring optimal chemical absorption.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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