Active ingredient and biochemical mode of action
Nominee Gold contains Bispyribac Sodium 10% SC (suspension concentrate), a pyrimidinyl carboxy herbicide belonging to the ALS inhibitor class.
It inhibits acetolactate synthase (ALS), blocking the biosynthesis of essential branched-chain amino acids (valine, leucine, and isoleucine). Susceptible weed plants cease growing within hours, exhibiting chlorosis at growing points followed by complete weed desiccation.
- Active chemical: Bispyribac Sodium 10% SC.
- Herbicide classification: HRAC Group 2 (ALS inhibitor).
- High selectivity: Rice plants metabolize the chemical safely without experiencing vegetative setback or stunting.
Weed spectrum and application timing in rice
Nominee Gold is registered for both nursery beds, direct-seeded rice (DSR), and transplanted paddy fields.
It effectively controls challenging grassy weeds like Echinochloa species, alongside problematic sedges and broadleaf weeds.
- Application window: Applied post-emergence between 15 to 25 days after transplanting or sowing when weeds have 2 to 5 leaves.
- Grasses controlled: Echinochloa colonum (swank), Echinochloa crus-galli, and Ischaemum rugosum.
- Sedges & Broadleaves: Cyperus difformis, Cyperus iria, Eclipta alba, and Sphenoclea zeylanica.
Field water management and spraying technique
Correct water management before and after spraying is crucial for maximizing the efficacy of Bispyribac Sodium.
Drain standing water from the paddy field prior to application so that weed foliage is fully exposed to the spray droplets.
Re-flood the field 48 to 72 hours after application and maintain shallow standing water for 5 to 7 days to prevent secondary weed emergence.
- Drain water: Ensure no standing water covers weed leaves during spraying.
- Reflooding: Re-introduce irrigation water 2 to 3 days after spraying and maintain standing water depth.
- Nozzle type: Use knapsack sprayer equipped with flat fan or floodjet nozzles for uniform foliar contact.
Official source
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ICAR - National Rice Research Institute ↗Related on KisanPe
Common questions
What is the active chemical in Nominee Gold herbicide?
Nominee Gold contains Bispyribac Sodium 10% SC, a selective post-emergence herbicide for rice.
When is the best time to spray Nominee Gold in paddy?
It should be sprayed 15 to 25 days after transplanting or sowing when target weeds have 2 to 5 leaves.
Should standing water be drained before applying Nominee Gold?
Yes, drain standing water before spraying so weed leaves are exposed, and re-flood the field 2 to 3 days after application.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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