IUPAC name
(RS)-2-(4-Methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl)pyridine-3-carboxylic acid
81334-34-1 YesY
3D model (Jmol) Interactive image
ChemSpider 49445 N
ECHA InfoCard 100.118.758
KEGG C18864 YesY
PubChem 54738
Molar mass 261.28 g·mol−1
Density 1,34
Melting point 169-171
13.47 g/l
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Imazapyr is a non-selective herbicide used for the control of a broad range of weeds including terrestrial annual and perennial grasses and broadleaved herbs, woody species, and riparian and emergent aquatic species.[1] It is used to eliminate Lithocarpus densiflorus (Tan Oak) and Arbutus menziesii (Pacific Madrone). Additionally, imazapyr is used to control annual and perennial grass and broadleaved weeds, brush, vines and many deciduous trees. Imazapyr is absorbed by the leaves and roots, and moves rapidly through the plant. It accumulates in the meristem region (active growth region) of the plant. In plants, imazapyr disrupts protein synthesis and interferes with cell growth and DNA synthesis.[2]

Imazapyr is an ingredient of the commercial product Roundup GroundClear. A related herbicide called imazapic is an ingredient in Roundup Extended Control. Both chemicals are non-selective, long-lasting, and effective in weed control. They are, however, water-soluble, and depending on soil type and moisture they can move into parts of the landscape where they weren't sprayed. Some desirable landscape plants are especially sensitive to them and can be damaged. Sensitive species include ash, linden, and cherry trees, and oleander bushes.[3]


  1. Reregistration Eligibility Decision for Imazapyr, U.S. Environmental Protection Agency
  2. "Imazapyr" (PDF). Toku-E. 2010-10-10. Retrieved 2012-06-11.
  3. "Roundup is Roundup…Right?". Colorado State University Extension. 2013-06-03. Retrieved 2016-01-09.
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