Nominee Gold Herbicide: Bispyribac Sodium 10% SC

Active Chemistry and Selective Mode of Action

Bispyribac-sodium provides targeted systemic control over a broad range of troublesome paddy weeds.

Key biochemical attributes:

• Active ingredient: Bispyribac-sodium formulated as a 10% SC (suspension concentrate).
• ALS enzyme inhibition: Belongs to Group 2 herbicides, inhibiting acetolactate synthase (ALS) and halting branched-chain amino acid synthesis (valine, leucine, isoleucine).
• Crop safety mechanism: Rice plants possess natural metabolic pathways that rapidly degrade the chemical, while target weeds experience chlorosis and die within 10 to 14 days.
• Target weed spectrum: Effectively suppresses barnyard grass (Echinochloa crus-galli, Echinochloa colona), false daisy (Eclipta alba), and sedges (Cyperus iria, Cyperus difformis).

Application Timing, Water Management and Surfactants

Optimal herbicidal efficacy depends on proper application timing and strict field water management.

Application protocols for rice growers:

• Application window: Apply when weeds are actively growing at the 2 to 4 leaf stage (typically 15 to 25 days after transplanting or sowing).
• Field dewatering: Drain standing water completely prior to spraying so target weed foliage is fully exposed to spray droplets.
• Re-flooding protocol: Re-irrigate the field within 48 to 72 hours after spraying and maintain shallow standing water for 5 to 7 days to prevent new weed flushes.
• Surfactant mixing: Co-apply with the recommended non-ionic surfactant adjuvant provided or approved by the manufacturer to ensure optimal leaf wetting and cuticle absorption.

Field Application Guidelines and Crop Safety

Adhering to proper spraying practices ensures thorough weed control without risk of crop stress.

Key stewardship recommendations:

• Nozzle recommendation: Use flat fan or floodjet nozzles fitted on a manual knapsack or power sprayer to ensure uniform spray delivery.
• Avoid tank-mix conflicts: Avoid mixing with organophosphate insecticides within 10 days of herbicide treatment to prevent temporary crop phytotoxicity.
• Spray volume: Maintain adequate water volume (typically 120 to 150 liters per acre) for complete foliage coverage.
• Operator protection: Wear personal protective equipment including rubber gloves, eye goggles, and protective outerwear during mixing and field spraying.

Related on KisanPe

• Rice Farmers →
• Crop Protection →
• Pesticide Calculator →
• Ask Sakhi AI →

Common questions

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.