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Herbicides, Imidazolinones

  1. Dale Shaner

Published Online: 15 APR 2003

DOI: 10.1002/047126363X.agr135

Encyclopedia of Agrochemicals

Encyclopedia of Agrochemicals

How to Cite

Shaner, D. 2003. Herbicides, Imidazolinones. Encyclopedia of Agrochemicals. .

Author Information

  1. Colorado State University, USDA-ARS, Fort Collins, Colorado

Publication History

  1. Published Online: 15 APR 2003


The imidazolinone herbicides represent a powerful tool for weed management. There are six different imidazolinone herbicides (imazamethabenz methyl, imazethapyr, imazamox, imazapic, imazapyr, and imazaquin) used in leguminous crops, cereals, forestry, non-cropland, and on imidazolinone-resistant maize, rice, canola, sunflower, and wheat. These herbicides share certain attributes such as low toxicity on animals, birds, fishes, and invertebrates, but they differ in their crop selectivity. Crop selectivity depends on the chemical structure of the imidazolinone. In this review, one can easily compare and contrast the different properties of the imidazolinones that affect their selectivity and environmental fate. The toxicological profile of each herbicide is presented as well as the weed spectrum for each compound. In addition, the degradation pathway for each herbicide in the soil and plants is shown.


  • selectivity;
  • metabolism;
  • degradation;
  • toxicology;
  • weed spectrum;
  • acetolactate synthase;
  • acetohydroxyacid synthase;
  • soybeans;
  • legumes;
  • wheat;
  • cereals;
  • forestry;
  • non-cropland;
  • herbicide-resistant crops;
  • mechanism of action;
  • environmental fate