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The isolation of yeasts from honey samples from the Province of Jujuy, Argentina, was sought with the aim of using them in vitro as antagonists of pre- and postharvest pathogenic molds of different crops of interest, such as, citrus fruits, peanut and sugar cane. Honey was used, since it can act as a selective medium for innocuous strains, and tolerant to different abiotic stresses, such as low pH, high osmotic pressure, presence of phytochemicals, among others. A total of 15 yeasts were isolated from 25 honey samples. Yeasts were identified as: Candida parapsilosis, Zygosaccharomyces baili, Zygosaccharomyces mellis, Zygosaccharomyces rouxii, Tausonia pullulans, Lachancea thermotolerans, Lachancea fermentati, Torulaspora delbrueckii y Saccharomyces cerevisiae. All genera were founded to be described as present in honey, originated from either primary sources of contamination, or the surrounding environment. Of the isolates obtained, antagonism was tested in vitro, by decreasing the mycelial growth of molds: Penicillium italicum, P. ulaiense, Aspergillus parasiticus and Fusarium sacchari. Lachancea thermotolerans, was the only isolation that presented antagonism towards all the molds tested. Candida parapsilosis presented antagonism towards P. italicum, Lachancea fermentati towards P. ulaiense, Z. mellis against P. ulaiense, and one of the isolates of T. delbrueckii against P. italicum and P. ulaiense. Antagonistic yeasts could be used, in future in vivo tests, in view of the design of an active biofungicide against crop pathogenic molds, at field production stage, or during storage.

Levaduras aisladas de mieles como antagonistas de mohos patógenos de cultivos