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Utilization of biocontrol agents is a sustainable approach to reduce plant diseases caused by fungal pathogens. In the present study, we tested the effect of the candidate biocontrol fungus  Aureobasidium pullulans  (De Bary) G. Armaud on strawberry under in vitro and in vivo conditions to control crown rot, root rot and grey mould caused by  Phytophthora cactorum  (Lebert and Cohn) and  Botrytis cinerea  Pers, respectively. A dual plate confrontation assay showed that mycelial growth of  P. cactorum  and  B. cinerea  was reduced by 33–48% when challenged by  A. pullulans  as compared with control treatments. Likewise, detached leaf and fruit assays showed that  A. pullulans  significantly reduced necrotic lesion size on leaves and disease severity on fruits caused by  P. cactorum  and  B. cinerea . In addition, greenhouse experiments with whole plants revealed enhanced biocontrol efficacy against root rot and grey mould when treated with  A. pullulans  either in combination with the pathogen or pre-treated with  A. pullulans  followed by inoculation of the pathogens. Our results demonstrate that  A. pullulans  is an effective biocontrol agent to control strawberry diseases caused by fungal pathogens and can be an effective alternative to chemical-based fungicides.

Biological control of strawberry crown rot, root rot and grey mould by the beneficial fungus Aureobasidium pullulans