Abstract
Natural aflatoxin contamination of developing corn (Zea mays L.) kernels was studied in one synthetic and 19 hybrids that varied in endosperm and other characteristics. The genotypes were grown at nine diverse locations in the USA in 1980 and 1981. The highest mean aflatoxin level (1846 ng g−1) was detected in kernels of Mo17 ✕ B73. Elevated toxin accumulations were also observed in a waxy hybrid. A normal endosperm hybrid (SC54)✕ SC76) and a synthetic (MoSQA(H)C6) had the est mean toxin levels. From 90 to 100% of the samples from the South and 2 to 25% of the Corn Belt samples were aflatoxin positive. Elevated toxin concentrations (>100 ng g−l) were associated with a high toxin incidence. However, some locations provided numerous, contaminated samples with relatively low levels of aflatoxin. Elevated aflatoxin levels were also associated with increased insect damage.
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