الفهرس 
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Abstract
Biological control is an intersting problem in applied GCology. The earliest proposed method of biological control was the naturally inoculation of soil or plant tissues with antagonistic microorganisms. However, one of the approaches of the biological control of root diseases, is the study of the relation between rhizosphera microflora and some root diseases. Therefore the present study was carried out to investigate interaction between rbizospbere microflora and wilt-inducing Fusarium of tomato and watermelon.
In general, data obtained in the present investigation may be summarized as fOllow:
I- The pathogonic fungi which were isolated from diseased plants of either tomato or watermelon showed typical symptoms of both Fusarium wilt of tomato and of water melon. The causative agents were identified. Pathoger lcity tests showed that Fusarium oxysporum f. lycopers1ci and F.oxysporum f. niveum were the causative agents of Fusarium wilt of tomato and of watermelon varieties respectively. The results also indicated that Marmand tomato variety was resistant to _F.oxysporum f. lycopersici while Money Maker tomato variety was susceptible to the Same, fungus. With regard to watermelon.