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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