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  1. Raymond Hammerschmidt

Published Online: 15 APR 2003

DOI: 10.1002/047126363X.agr310

Encyclopedia of Agrochemicals

Encyclopedia of Agrochemicals

How to Cite

Hammerschmidt, R. 2003. Juglone. Encyclopedia of Agrochemicals. .

Author Information

  1. Michigan State University, East Lansing, Michigan

Publication History

  1. Published Online: 15 APR 2003


Juglone (5-hydroxynapthoquinone) is found in the leaves and other parts of walnut, hickory, and pecan. It is synthesized from isochorismic acid and 2-oxo-glutaric acid. Juglone is probably best known as the allelochemical produced by black walnut. Juglone is also antifungal and attempts to correlate its presence with disease resistance in pecan, black walnut, and hickory to several fungal pathogens have been reported.


  • juglone;
  • 5-hydroxynapthoquinone;
  • isochorismic acid;
  • 2-oxo-glutaric acid;
  • allelochemical;
  • black walnut;
  • fungal pathogens