This study confirms in-vitro biological activity of T. harzianum towards A. alternata. It has shown strong reducing effect on the development of A.alternata with various mechanisms of antagonistic influence.
The diffusible metabolites have shown bigger reducing effect than volatile. This biocontrol agent caused abnormalities in the pathogens's morphology.
The strong reducing effect of T. harzianum towards A. alternata can be applied in biological control of this pathogen.