A new substantially pure biological harvest of the bacterian strain Pantoea agglomerans (Erwinia herbicola) deposited with number CECT-4920 is described, together with its use as an antagonist for the biological control of the fungi responsible for the rotting of the fruit. The effectiveness of said antagonist is very high, comparable to that of the most widely used antifungic products. Said activity shows itself with special intensity under storage conditions at low temperatures. The antagonist is effective in combatting the rotting caused by, amongst other microorganisms, fungi of the species Botrytis cinerea, Penicillium digitatum, Penicillium expansum, Penicillium italicum and Rhizopus stolonifer.
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