In accordance with embodiments of the present invention, a produce label applicator machine is retrofitted with a system such that the positive/negative air pressure at the label applicator bellows is configured to introduce and apply a bacteria or maturity inhibiting substance/gas/chemical to the surfaces of the labels as they are being applied to the produce. A source of bacteria or maturity inhibiting substance/gas/chemical is coupled to a fast-acting valve, that is in communication with the air passageway of the label dispensing arms/bellows.