Active ingredient and biochemical mode of action
- Active ingredient: Bispyribac-sodium 10% SC (pyrimidinyl carboxy group, HRAC/WSSA Group 2).
- Mode of action: Inhibits the acetolactate synthase (ALS) enzyme, halting the biosynthesis of essential branched-chain amino acids in weeds.
- Systemic absorption: Rapidly absorbed through weed foliage and roots, moving acropetally and basipetally throughout the weed plant.
- Weed response: Affected weeds stop growing within hours, turn chlorotic at growing tips, and wither completely in 10 to 14 days.
Target weeds and crop selectivity in paddy
- Grass weeds: Echinochloa crus-galli, Echinochloa colona, and Ischaemum rugosum.
- Sedges: Cyperus difformis, Cyperus iria, and Fimbristylis miliacea.
- Broadleaf weeds: Eclipta alba, Ludwigia parviflora, and Sphenoclea zeylanica.
- Crop selectivity: Exceptional physiological selectivity for rice cultivars at recommended dosage rates.
- Field methods: Highly effective in both direct-seeded rice (dry/wet DSR) and puddled transplanted paddy fields.
Application window, water management, and spraying guidelines
- Application window: Spray when weeds are at the 2 to 4-leaf stage (typically 15 to 25 days after sowing or transplanting).
- Water management: Drain standing water from the field prior to spraying, and re-flood the field 48 hours after application to maintain weed suppression.
- Equipment: Use a knapsack sprayer fitted with a flat fan or floodjet nozzle delivering 120 to 150 litres of water per acre.
- Follow approved CIB&RC label doses and avoid spraying under severe crop moisture stress.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the technical chemical in Nominee Gold?
Nominee Gold contains Bispyribac-sodium 10% SC, a selective post-emergence rice herbicide.
What weed species are controlled by Nominee Gold in paddy?
It controls barnyard grass (Echinochloa spp.), rice sedges (Cyperus spp.), and common broadleaf weeds.
When should Nominee Gold be applied in rice fields?
It should be applied 15 to 25 days after transplanting or sowing when weeds have 2 to 4 leaves.
Should water be kept in the paddy field during spraying?
Drain standing water before spraying to expose weed foliage, and re-flood the field 2 to 3 days after spraying.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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