Sterigmatocystin (ST) as an aflatoxin intermediate, is the early-stage intermediate during the synthesis of aflatoxins. ST is mainly produced by fungi such as Aspergillus versicolor, Aspergillus flavus, Aspergillus nidulas, and Aspergillus rugulosus, etc., may contaminate most of grains and forage grasses, and in particular severely contaminate wheat, maize, peanut and forage grasses.