الفهرس 
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Abstract
These investigation were designed to isolate and identify potential macrocyclic tricothicecens producing and non- producing fungal isolate to evaluate their bioherbicidal activities. Sixty soil and 20 tomato root samples were collected from different locations in Sohag city. The mycobiota of the collected samples was isolated on glucose, cellulose - Czapek’s agar media at pH 6.5 & 8.5. The main results obtained during this investigation could be summarized as follow:- 1- A total of 80 species plus 3species varieties belonging to 27 genera of filamentous fungi were isolated and identified. 2- Taxa isolated are assigned to three taxonomic groups: Ascomycetes represented by four species (collectively accountin g for 5.00 % of total number of fungal species), Hyphomycetes, represented by the greatest number of species(71species plus three species variety) belonging to 23 genera (accounting for 88.75% of total number of fungal species) and Zygomycetes, represented by5 species (accounting for 6.25% of total number of fungal species recorded in this study. 3- Aspergillus showed the greatest spectrum by being represented by 18 species and three species varieties, followed by Penicillium (12species), Fusarium (6species), Myrothecium (5 species) Trichoderma (5 species), Drechslera , Emericella (4species ), and Cladosporium (3species),Botryotrichium,Scopulariopsis,Mucor, and Rhizopus (2species).The remaining 15 genera were represented by only one species for each genus. 4-Penicillium was represented by 12 species belonging to three