Imazethapyr 10 SL Herbicide: Soybean & Groundnut Weed Care

Chemical Class and ALS Enzyme Inhibition

Imazethapyr belongs to the imidazolinone chemical family (HRAC Group 2 - ALS inhibitors). It functions by inhibiting acetolactate synthase (ALS / AHAS), the key enzyme required for synthesizing branched-chain amino acids (leucine, isoleucine, and valine).

Leguminous crops like soybean and groundnut rapidly metabolize Imazethapyr into non-toxic compounds, ensuring high crop selectivity. In susceptible weeds, cell division ceases in apical meristems within hours, leading to chlorosis, purple vein discoloration, and complete necrosis.

• HRAC Group 2 Mode of Action: Blocks essential branched-chain amino acid biosynthesis in weeds.
• High Legume Selectivity: Completely safe for soybean, groundnut, and black gram when applied per label directions.
• Dual Foliar & Soil Activity: Absorbed through both weed foliage and roots, providing both burndown and short residual barrier defense.

Target Weed Spectrum in Soybean and Groundnut

Early weed competition during the initial 30 days after sowing can reduce soybean and groundnut pod yields by 30% to 50%. Imazethapyr 10% SL is engineered to manage diverse weed complexes in rainfed legume belts.

Key controlled broadleaf weeds include Commelina benghalensis (dayflower / kankawa), Trianthema portulacastrum (carpetweed), Digera arvensis, and Amaranthus viridis, alongside annual grasses such as Echinochloa colona and Dactyloctenium aegyptium.

• Commelina Control: Outstanding control over stubborn Commelina benghalensis dayflower weeds.
• Carpetweed Suppression: Rapidly shuts down aggressive Trianthema carpetweed seedlings.
• Grassy Weed Kill: Suppresses barnyard grass and crowfoot grass competing for soil moisture.

Application Timing and Spray Guidelines

Apply Imazethapyr 10% SL as an early post-emergence spray when weeds are at the 2 to 4 leaf stage (typically 15 to 25 days after sowing). Ensure adequate soil moisture is present during application.

Use a knapsack or tractor boom sprayer fitted with flat fan nozzles to achieve uniform foliar coverage. Avoid spraying during severe drought or when crops are under acute moisture stress.

• Optimal Weed Stage: Spray when weed seedlings are actively growing at 2 to 4 leaves.
• Soil Moisture Requirement: Adequate moisture ensures rapid weed absorption and translocation.
• Nozzle Selection: Flat fan nozzles produce even, overlapping spray fans across crop rows.

Related on KisanPe

• Crop Protection Advisory →
• Soil Health Management →
• Wheat Farmer Solutions →
• Pesticide calculator →
• Ask Sakhi AI →

Common questions

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