Healthy leaflets of tomato were detached from 40-day-old plants grown in a greenhouse. Leaf discs (1 cm diameter) were prepared from the leaflets using a cork borer. They were immediately dried at 60 C for 72 h to kill the plant cells and placed on moisturized filter papers in Petri dishes (9 cm diameter), 10 leaf discs per dish. Aliquots (10 lL) of the conidial suspension (5 107 conidia/ mL) of each isolate of Trichoderma were pipetted on the leaf discs, 10 lL conidial suspension per disc, three dishes (replicates) for each Trichoderma isolate. The leaf discs treated with sterile distilled water were served as control. Then, aliquots of the Botrytis conidial suspension (1 105 conidia/mL) were inoculated on the leaf discs, 10 lL conidial suspension per disc. The dishes were placed in an incubator at 20 C under 12-h light/12-h dark for four days. Sporulation of B. cinerea on each leaf disc was scored based on the area with B. cinerea conidiophores and conidia using the numerical rating scale 0–4, where 0 indicates no sporulation by B. cinerea at all, whereas 1, 2, 3 and 4 indicate