Abstract: Trichoderma harzianum 6776 has shown a biological control activity againstRhizoctonia solani on radish under two different inoculation procedures. When tested on tomatoseedlings, it is able to stimulate plant growth under greenhouse condition. In addition, biocontrolactivity against soil-borne pathogens (R. solani, Fusarium oxysporum f. sp. lycopersici andF. oxysporum f. sp. radicis-lycopersici) has been evaluated on tomato, showing positive resultsand suggesting a future employment of this strain as biopesticide.