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When there is a lot of broadleaf weed activity on your property, a herbicide active ingredient that works well to get rid of these invasive plants is Imazapyr.

Solutions Pest & Lawn has a quality selection of herbicide products in stock which contain the active ingredient Imazapyr and we highly recommend this product to our customers who want to control broadleaf weeds. On this page you can gain some background info about imazapyr, it’s mode of action and benefits. You can also access this page to shop our entire line of products which contain imazapyr.

What is Imazapyr?

Imazapyr (chemical name (RS)-2-(4-Methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl)pyridine-3-carboxylic acid) is a non-selective herbicide specially designed for the control of a broad range of weeds including annual and perennial grasses broadleaf species and woody species. Imazapyr is from the herbicide family imidazolinone.

The herbicide active ingredient is commonly found in two forms: weak acid and isopropylamine salt. Imazapyr is also an aquatic herbicide and was registered with the EPA as an aquatic herbicide in 2003. Imazapyr was first registered for commercial use as a isopropylamine salt called Arsenal in 1984 and again with the formulation Chopper in 1993.

Imazapyr is a systemic herbicide and is absorbed by the leaves and roots, and moves rapidly through the plant.

How Does Imazapyr Work?

Imazapyr’s mode of action works by inhibiting the synthesis of certain amino acids produced by plants but not animals. Imazapyr is an amino acid synthesis inhibitor and kills plants by inhibiting the production of the branched-chain aliphatic amino acids which are required for DNA synthesis and growth. Plants treated with imazapyr typically die slowly.  Imazapyr is primarily absorbed through plant tissue, but can also be absorbed through roots in the soil. 

Plants stop growth initially in the roots and continue in the above ground portions, with complete death occurring approximately one month after treatment, depending on environmental conditions. Animals do not synthesize their own three branched-chain aliphatic amino acids, but obtain them by eating plants and other animals; therefore absorption of the compound is not possible during aerial or spot application to soils. · Imazapyr is a slow-acting inhibitor which can take a few weeks and generally is most effective during axillary budding (post-emergent) 

Browse our selection of imazapyr contained products below. For more information about imazapyr or other active ingredients in our herbicides, reach out to us with your questions at 800-479-6583 or email us at askapro@solutionsstores.com.

Featured Products Which Contain Imazapyr

Imazapyr 2 SL Herbicide - Imazapyr 2 SL Herbicide is formulated as a pre-emergent and post-emergent for control of unwanted vegetation in non-cropland areas. Imazapyr can also be used in pastures and rangelands as a soil sterilizer to ensure nothing will grow along fence lines.


Imazapyr 4 SL Herbicide- Imazapyr 4 SL Herbicide is a pre-emergent and post-emergent bare ground herbicide for control of unwanted vegetation in non-cropland areas and aquatic sites. It will sterilize the soil it is sprayed over and nothing will grow for up to 1 year. Imazapyr Can also be used in pastures, rangelands and other listed areas.


Ecomazapyr 2 SL Aquatic Herbicide - Ecomazapyr 2 SL Herbicide is formulated as a pre-emergent and post-emergent for control of emergent and floating aquatic vegetation in aquatic sites and terrestrial habitats. Ecomazapyr may also be used for cut stump, frill, cut stem, and girdle applications.

Is Imazapyr Safe To Use?

Imazapyr is practically non-toxic (the EPA’s lowest toxicity category) to fish, invertebrates, birds and mammals. Concentrated imazapyr has low acute toxicity on the skin or if ingested, but is harmful if inhaled and may cause irreversible damage if it gets in the eyes.


It is recommended that when handling Imazapyr (or any of the other chemicals we carry) to use proper personal protective equipment (PPE) before handling or applying. Gloves, goggles, long sleeved clothing should be the minimum standard. Please refer to the label for proper safety instructions.

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