Towards understanding of fungal biocontrol mechanisms of different yeasts antagonistic to Botrytis cinerea through exometabolomic analysis

•The yeast exometabolome changes after co-culture with a fungal pathogen.•Both general and yeast strain-specific metabolites are differentially secreted.•Several metabolites have antifungal properties in vitro but only two in vivo.•Trans-cinnamic acid is the best antifungal metabolite secreted by yeasts.•Indole-3-carboxaldehyde shows lower levels of protection.