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Herbicides, Plant Hormone Mimics—Auxins

  1. L. J. Shane Friesen,
  2. Laura L. Van Eerd,
  3. Christopher Hall

Published Online: 15 APR 2003

DOI: 10.1002/047126363X.agr199

Encyclopedia of Agrochemicals

Encyclopedia of Agrochemicals

How to Cite

Friesen, L. J. S., Van Eerd, L. L. and Hall, C. 2003. Herbicides, Plant Hormone Mimics—Auxins. Encyclopedia of Agrochemicals. .

Author Information

  1. University of Guelph, Guelph, Ontario, Canada

Publication History

  1. Published Online: 15 APR 2003


Synthetic auxins act in a very similar way to the natural plant hormone auxin, and they may become herbicidal to numerous plant species, i.e., causing an “auxin overload,” if applied at a sufficient dose. Many of these compounds have been synthesized over the past century, and some have been developed into potent commercial herbicides. Due to commercial success, chemical companies have pursued the development of other organic herbicides for use in agriculture, and thus have contributed to the creation of multi-billion–dollar worldwide pesticide industry of today.


  • synthetic auxins;
  • phenoxy acids;
  • 2,4-D;
  • 2,4-DB;
  • dichlorprop;
  • MCPA;
  • MCPB;
  • benzoic acids;
  • mecoprop-P;
  • TBA;
  • pyridine acids;
  • fluroxpyr;
  • picloram;
  • triclopyr;
  • quinolinecarboxylic acids;
  • quinclorac;
  • quinmerac;
  • benazolin