Chemical properties and ALS enzyme inhibition mechanism
Imazethapyr provides systemic absorption through both roots and foliage, moving rapidly to growing meristematic tips.
- Acetolactate synthase (ALS, HRAC Group 2) inhibitor: Halts synthesis of essential amino acids (valine, leucine, and isoleucine).
- Halts plant cell division and protein synthesis: Susceptible weeds cease competitive growth within hours of application.
- Dual root and foliar absorption: Absorbed through active foliage and washed into the topsoil to provide residual pre-emergence control.
- High physiological selectivity: Soybean and groundnut plants rapidly metabolize and detoxify the chemical without phytotoxic injury.
Target weed spectrum in soybean and groundnut
Imazethapyr is registered under CIBRC regulations to control aggressive early weed complexes.
- Broadleaf weeds: Highly effective against Commelina benghalensis (dayflower), Digera arvensis, Trianthema portulacastrum, and Amaranthus viridis.
- Grassy weeds: Suppresses Echinochloa colona (barnyard grass), Digitaria sanguinalis (crabgrass), and Dactyloctenium aegyptium.
- Sedges: Provides partial suppression of purple nutsedge (Cyperus rotundus) during early germination flushes.
- Application timing: Apply post-emergence at 15 to 25 days after crop sowing when weeds are in the 2 to 4 leaf stage.
Application guidelines, soil moisture, and crop rotation precautions
Apply Imazethapyr when the soil has adequate moisture using flat fan nozzles for uniform foliar misting. Because imidazolinone herbicides can exhibit soil carryover persistence, avoid planting sensitive crops (like mustard, maize, or cotton) immediately following soybean without observing prescribed rotational recropping intervals. Operators must wear protective gloves and eye protection.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Central Insecticides Board and Registration Committee ↗Related on KisanPe
Common questions
What is the technical chemical family of Imazethapyr 10% SL?
Imazethapyr belongs to the imidazolinone chemical class (HRAC Group 2), operating as an acetolactate synthase (ALS) inhibitor.
Which major crops are approved for Imazethapyr 10% SL in India?
It is officially registered for selective post-emergence weed control in soybean and groundnut crops.
What is the ideal weed growth stage for applying Imazethapyr?
Apply when target broadleaf and grass weeds are young, actively growing, and in the 2 to 4 leaf stage in moist soil.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More Crop Protection & Pesticides guides
Ask Sakhi AI in your language, check live mandi prices or plan a loan with KisanPe tools.