Substantially pure biological culture of a strain of the species Pseudomonas graminis, deposited with number CBS136973 at the depositary institution “Centraalbureau voor Schimmelcultures” (CBS) in Utrecht, Netherlands. Use of the CBS136973 culture as an antagonist for the biocontrol of foodborne pathogenic bacteria in fruit intended for human consumption. Method for treating the fruit which comprises the step of applying a preparation that comprises a culture of a strain of the species Pseudomonas graminis, deposited with number CBS136973 at the depositary institution “Centraalbureau voor Schimmelcultures” (CBS) in Utrecht, Netherlands, to the fruit. The application thereof makes it possible to reduce the growth of pathogens during the shelf life of the product, especially when the cold chain is broken.