Active Ingredient Profile and ALS Mode of Action
Imazethapyr belongs to the imidazolinone chemical class (IRAC Group 2), formulated as concentrated water-dispersible granules (70% WG).
It works by inhibiting the acetolactate synthase (ALS) enzyme, halting the biosynthesis of essential branched-chain amino acids (valine, leucine, and isoleucine).
Weed growth stops within hours of foliar absorption, followed by chlorosis of terminal buds and complete weed death over ten to twenty days.
- Formulation: 70 percent Water Dispersible Granules (WG)
- Dual uptake: Absorbed through both weed foliage and roots from moist soil
- Broad spectrum: Simultaneously controls broadleaf weeds and annual grasses in a single application
Target Weeds and Approved Crop Applications
Imazethapyr 70 WG is registered for post-emergence application in soybean and groundnut crops.
Applications should target actively growing weeds at the two to four leaf stage, typically ten to twenty days after crop sowing.
- Broadleaf weeds: Controls Trianthema portulacastrum, Commelina benghalensis, Digera arvensis, and Amaranthus viridis
- Grassy weeds: Suppresses Echinochloa colona, Dactyloctenium aegyptium, and Digitaria species
- Application window: Spray when the crop has one to two trifoliate leaves and weeds are young
Spraying Instructions, Surfactant Pairing, and Safety
Dissolve the water-dispersible granules directly into the spray tank under mild agitation, pairing with an approved non-ionic surfactant.
Ensure adequate soil moisture is present during application, as moisture-stressed weeds exhibit reduced chemical absorption.
Wear standard personal protective equipment during chemical handling and spraying.
- Surfactant addition: Always mix with recommended non-ionic surfactant or adjuvant for optimal foliar spreading
- Water volume: Use clean water with flat fan nozzles for uniform broadcast coverage
- Personal protection: Wear chemical-resistant gloves, protective clothing, and eye goggles during preparation
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the technical chemical in Imazethapyr 70 WG?
It contains Imazethapyr 70% WG, a selective systemic post-emergence imidazolinone herbicide.
In which crops is Imazethapyr 70 WG primarily used?
It is primarily registered and applied for selective post-emergence weed control in soybean and groundnut fields.
Does Imazethapyr control both grasses and broadleaf weeds?
Yes, Imazethapyr provides broad-spectrum control of both major broadleaf weeds and annual grasses.
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.