Observation 132822: Aspergillus ochraceus K. Wilhelm
When: 2005-09-01
No herbarium specimen

Notes: Spores from an almond with Navel Orangeworm lavae damage found at the USDA Wolfskill Germplasm Repository near Winters, CA were transfered to agar media plates for colony growth and identification. Aspergillus ochraceus was the first fungus discovered to produce ochratoxin though many isolates including this one are atoxigenic. It is a common contaminant of grains, cereals, coffee, tree nuts, figs, and other food stuffs. The 4 Aspergillus species most responsable for ochratoxin contamination of foods are A. carbonarius, A. steynii, A. westerdijkiae, and lastly A. ochraceus. Penicillium verrucosum is the major producer of OTA in cereals such as wheat and barley in temperate and cold climates.

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Recognized by sight: Spores from infected pistachio nuts found at the USDA Wolfskill Germplasm Repository near Winters, Ca. were transfered to agar media plates for colony growth and identification.
Used references: The genus Aspergillus by Rapier KB, Fennel DI.
Klich MA (2002). Identification of common Aspergillus species.
Mycopathologia. 2006 Sep;162(3):215-23. Ochratoxins: a global perspective. Bayman P, Baker JL.
Appl Environ Microbiol. 2002 May; 68(5): 2326–2329.Ochratoxin Production by the Aspergillus ochraceus Group and Aspergillus alliaceus Paul Bayman,James L. Baker, Mark A. Doster, Themis J. Michailides, and Noreen E. Mahoney

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Created: 2013-05-01 23:42:57 PDT (-0700)
Last modified: 2017-07-20 13:23:32 PDT (-0700)
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