Although B. linens IC10 and B. subtilis had similar in vitro efficacy against both fungal mycelia, their activity was much different in suppressing tomato fruit diseases. Indeed, the bacteria were much more effective in controlling B. cinerea on tomato whereas they were much less effective against A. solani. This was also apparent when assessing antifungal compounds in the crude bacterial extracts. Again, bacterial extracts showed similar antifungal effects against mycelial growth and spore germination of both fungi, whereas they were much less effective against A. solani in vivo. This may indicate that mechanisms in addition to antibiosis might be involved in the increased suppressive effects of the bacteria toward B. cinerea, such as induction of plant defense mechanisms in the tomato ( Zhang et al., 1998, Haggag and Saber, 2007 and Siddiqui et al., 2009).