Methods and compositions for inhibiting or dispersing biofilms produced by Listeria monocytogenes on plant matter are described. Embodiments include using formulations comprising active chemical constituents and aqueous extracts or sap from certain trees. Methods of using and producing aqueous formulations derived from hickory and maple wood are provided. Formulations and methods are provided for preventing and dispersing exopolysaccharide-rich listerial biofilms.

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