A method of reducing toxins in stored crops comprises producing a stream of aqueous or gas ClO2 and exposing the stored crops to the ClO2 wherein the ClO2 kills toxin-producing microorganisms and/or reacts with toxins to reduce the toxins in said stored crops. An apparatus for reducing toxins in stored crops comprises a treatment area for containing the stored crops and a ClO2 generator comprising an inlet for introducing at least one chlorine-containing feed chemical and an outlet for exhausting a stream of aqueous or gas ClO2 from the generator into the treatment area wherein introducing the ClO2 kills toxin-producing microorganisms and/or reacts with toxin molecules to reduce the toxins in the stored crops.
