A process for biologically controlling the preharvest accumulation of aflatoxin in soil-borne crops. Non-aflatoxigenic strains of Aspergillus parasiticus having all of the relevant identifying characteristics of NRRL 18786 and NRRL 18991 are shown to inhibit aflatoxin production by native toxigenic strains of Aspergillus flavus or Aspergillus parasiticus in the soil environment.
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