الفهرس 
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Abstract
The responses of soybean cv. Crowford and suaflower cv. Miak, susceptible to infection by the charcoal rot pathogen A’!. phaseolina and the Fusarium root rot pathogenic fimgus F. solani fsp. phaseoli, in pot studies in the greenhouse were determined. Diseases symptoms at various stages of plant development were evaluated using morphological and histological approaches. Hence, the individual pathogenic characteristics of these two fungi were firstly demonstrated on the soybean and the sunflower plants using excised organs (hypocotyls) of the plants under environmental controlled conditions. Th - Secondly, the pathogenicity was also employed to the seeds which were infected separately with each of the pathogens of concern, by applying its inoculum incorporation with the soil, under greenhouse condition. That methodology is important in demonstrating and clarifying pathogenicity in particular at the various stages of plant development. Both fungi caused a diversity of symptoms on both tested plants. Both fungi were considered a potential causal agents of blight as well as root and foot-rot of the infected plants, whether at the seedling stage, the vegetation stage or even at older stages (flowering and fruiting). The pathogenic types of both fungi demonstiated maiked effects on the health and chysiology of the plants, wilt was also one of the most common among the other symptoms A zompanson of soybean and sunflower plants indicated that both fimgi, sepaiately, have naiked effects.on the health and physiology of the plants iesulting in losses in seed Definitive histological studies of infection chatactenstics of these fungi by light ticloscopy ate lacking in tins study The bacterial antagonist B sub/i/is and T haizianum were all tested wider greenhouse conditions The other biocontrol agents used included the two selected isolates.