Abstract
Abstract and SummaryOver 700 individual aflatoxin‐suspect cottonseed were hand‐selected from a heterogenous stockpile of ginned seed. The seed were categorized on the basis of (a) bright greenish‐yellow, fluorescence termed cateye, on the linter fibers under ultraviolet light; (b) partially bald seed with part of the linter fibers removed by ginning; (c) a combination of cateye and balding; (d) thin and discolored lint; and (e) bluish, not cateye, fluorescence. Aflatoxin assays on each of the 771 selected seed showed that 142 out of 771 (18%) were contaminated by aflatoxin (B1+B2) in the range of 150 ppb—5.75 million ppb. Some 93% of the aflatoxin‐contaminated seed was concentrated in categories (a), (b), and (c), with the highest concentration, 61%, in category (b). Eight seed in these three categories contained over 1 million ppb of aflatoxins. The data suggest that removal of cateye and partially bald seed from contaminated lots of cottonseed should be more effective for controlling aflatoxin contamination in cottonseed than removal of cateye seed alone.
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