Occurrence of mycotoxins in cereals and animal feedstuffs in Natal, South Africa.
During the period 1982-83, just under 800 samples of agricultural commodities, comprising cereals, compound feeds, hay and silage, were examined. Aflatoxin B1 occurred in over 27% of all samples and in groundnut meal was 1500 ng/g. Other mycotoxins detected were patulin and a number of trichothecene toxins at incidence rates of 5.6 and 3.1%, respectively. The commodities at highest risk were oil seeds, excluding soyabean which was fairly free from mycotoxins. The most prevalent fungi were Aspergillus flavus and A. parasiticus, which occurred in over 22% of all samples, whereas Penicillium spp. had the lowest incidence of genera, specifically identified in 8.3% of all samples examined.