Abstract: The effectiveness of two Trichoderma spp. formulations in the control ofCylindrocarpon macrodidymum affecting table grapes cropped under a semi arid climateconditions (3th Region of Chile in Copiapó), was evaluated through trials conducted during twoseasons. The orchards were selected according C. macrodydimum damage (low growing ratio andyield of the plants). Treatments were run applying Trichoderma spp. into the soil as: a solidformulation, sodium alginate pellets including either a wild or an improved strain, and a liquidformulation of a commercial Trichoderma spp. biofungicide. An absolute control was also set.The experimental design was a complete randomized block. Results were analyzed by ANOVAand Tukey`s test. C. macrodidymum populations, before and after treatments were compared tocontrols, as well as percent of yield increase and yield per plant. Survival of Trichoderma spp. inthe soil of both formulations was also evaluated. Results showed that no statistical differenceswere observed in the C. macrodidymum populations after Trichoderma spp. treatmentsindependently of the type of formulation. However, percent of yield increase was statisticallysignificantly higher than control, when Trichoderma spp. formulations were applied. TheTrichoderma populations in the soil after treatment with the solid formulations was higher thanthe one obtained with the liquid biofungicide. The results indicate that soil treatments withTrichoderma spp. in table grapes affected by C. macrodidymum resulted in a yield increase intreated plants cropped in a semi arid region of Chile.