1. IntroductionFusarium wilts diseases are the two most widely distributed worldwide and economically important wilt diseasesof tomato ( Lycopersicon esculentum Mill.). (1). Fusarium oxysporum is the only pathogenic fungus isolated fromthe diseased roots (2). or lower parts of plants And etiological agent of Fusarium wilt is host specific, (1). Fusariumoxysporum is distributed worldwide in soil (3). So one of the most important genera of plant pathogenic fungi with arecord of devastating infections in various economically important plant (4) . but may also exist in symptomlessalternate hosts representing many species (1). In many plants of economic importance, whereas others appear to bevigorous saprophytes