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Pathogenic fungi that cause defoliation in different pine species, including  Pinus patula,  have been reported. The most common practice for controlling these pathogens is the use of fungicides, which have adverse environmental consequences. The objective of this study was to evaluate an alternative for pathogen control without affecting the ecosystem. Bacteria with antifungal activity obtained from forest soil were isolated and biochemically and molecularly identified for evaluation in biocontrol assays of fungi associated with defoliation under laboratory and field conditions. Two species of the genus  Serratia ,  Serratia grimesii  and  S. proteamaculans,  were identified as bacteria with antifungal activity.  In vitro  biocontrol was achieved by reducing the mycelium growth of fungi associated with diseased needles of  P. patula :  Alternaria alternata, Annulohypoxylon stygium, Botryosphaeria dothidea, Curvularia lunata, C. pseudobrachyspora, C. spicifera, C. trifolii, Daldinia  sp.,  Daldinia eschscholtzii, Diplodia sapinea, Lophodermium indianum,  and  Myrmaecium rubricosum . The fungi in  P. patula (Annulohypoxylon stygium  and  Daldinia eschscholtzii)  decreased their damage by 82% and 77%, respectively, in the presence of  Serratia  under humid chamber conditions. In addition, the incidence of lesions (IL) and Disease Severity Indexwere significantly reduced under natural conditions. The results showed that biocontrol with bacteria of the genus  Serratia  is an alternative for the management of health in  Pinus patula  trees.

Potential use of bacterial strain in the genus Serratia to biocontrol fungal pathogens associated with defoliation on Pinus patula