Defense system of the plant against pathogen attach is the ultimate goal of any controlling process of the pathogen. Biological controls represent an interesting strategy to stimulate the defense system of the plant. In the present study we investigated the protective effects of Trichoderma harzianum (T-1) and Trichodermahar asperellum (T-2) for controlling Fusarium rot of bean. Common bean roots were treated with T. harzianum (T-1) and T. asperellum (T- 2) individually and in combination with each other and planted in artificially infested soil with F. solani pathogen. Our findings indicated that prepared conidial suspensions either in water and 10% sugar solution effectively are able to reduce the colonization of the F. solani.
