الفهرس 
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Abstract
The present work aims at the elucidation of the relation between four Fusarium isolates obtained from diseased tomato plants (two varieties of Fusarium oxysporum, Fusarium solani and Fusarium semitectum) concerning their effect on tomato plant vigour. The four isolates of Fusarium were segregated on riceagar medium, where pigment-producing capacity and colour were variable from one isolate to the other.