Vineyard pruning waste composts (GC and GCTh) are suitable to
be used as suppressive growing media against FOM. The incorporation of T. harzianum not only increased the biocontrol capacity of
this compost (GCTh) compared to GC, but also induced changesin the biotic and abiotic characteristics of the compost. Changes
in the physico-chemical characteristics of the growing media could
induce changes in bacterial community composition and increase
the relative abundance of species of Streptomyces spp. and therefore, the suppressiveness of GCTh compost. These results should
lay the groundwork to optimize the use of biological control agents
and appropriate source materials so as to achieve high levels of
suppressiveness in composts. In addition, the use of plant experiments is required to obtain realistic conclusions concerning the
suppression capacity of composts amended with Trichoderma
species.