Abstract
The growth of storage moulds was studied in barley at 22% and approximately 28% moisture content treated with the recommended and reduced commercial doses of propionic acid over a 6 month storage period at 20°C. Experimental sample size was 5 kg barley per lot. Barley was fully protected against the growth ofA. flavus and aflatoxin formation when the recommended dose was applied. However, the treatment was less effective in controlling growth ofP. verrucosum and preventing ochratoxin A formation such that by 4 to 6 months of storage, the fungus had started to develop and toxin had formed even in some of the samples treated with propionic acid. The risk of the development of ochratoxin A during storage increased as the optimum dose was reduced, particularly for barley at 22% moisture content.
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