Maintaining the viability of introduced Trichoderma spp. in soil for a long time is often difficult (Budge and Whipps, 1991), especially in the rhizosphere. Different organic and inorganic substrates were tested for their ability to prolong the survival of Trichoderma in soil, with a particular emphasis on coniferous barks that are often used as mulch in orchards and gardens (Pellegrini et al., 2009