الفهرس 
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Abstract
Fusarium wilt disease, caused by pathogenic forma speciales of Fusarium oxysporum, can cause severe losses in tomato and a variety of other crop plants. Fuasrium diseases are generally controlled by fumigation with methyl bromide. Recently, there has been an increasing interest among biologists in using benifacial microorganisms as a solution to the overuse of potentially harmful pesticides. The present study is planned to evaluate the efficiency of potential antagonistic fungi, bacteria and actinomycetes as biocontrol agents for biocontrol of Fusarium wilt of tomato. The results could be summerized as follows: 1 The study began by isolating and purifying microorganisms including fungi, bactera and actinomycetes from tomato rhizosphere and pathogenic Fusarium from infected tomato of different areas of Damietta province. 2 The isolates were subsequently screened in vitro to select the potential antagonists activity against F. oxysporum f. sp. lycopersici. 3 The three most active isolates against F. oxysporum f. sp. lycopersici were identified. The isolates T23 was identified as Trichoderma harzainum, the isolate B3 was identified as Bacillus subtilisand the isolate A7 was identified as Streptomyces griseoviridis. 4 The pathogenicity test confirmed the responsibility of F. oxysporum f. sp. lycopersici for wilt of tomato and the isolate F2 was the most aggressive one. 5 A studying of some factors affecting the mycelial growth and sporulation of F. oxysporumf. sp. lycopersici. 6 The effect of some culture conditions on antimicrobial activity was studies. 7 Possibility of employing the antagonistic isolates T23, B3 and A7 for controling Fusarium wilt of tomato was also evaluated. 8 The changes in some physiological and metabolic activities in tomato plants were also evaluated.