Within the past two weeks, there have been several reports of aflatoxin detected in southern Iowa and also a few reports from central Iowa. Levels of aflatoxin have ranged from 8 ppb to almost 200 ppb. The FDA action level for aflatoxin in grain is 20 ppb.
Iowa State University
Robertson, Alison E. and Hurburgh, Charles R. Jr., "Aflatoxin Detected in Fields in Central and Southern Iowa" (2012). Integrated Crop Management News. 127.
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