Thesis (Ph.D.) - Cairo University - Faculty of African Postgraduate Studies - Department of Natural Resources

Tomato (Solanum lycopersicum L., syn., Lycopersicon esculentum Mill.); is an important vegetable crop not only for its economic value but also for its nutritional value. Wilt and root rot diseases of tomato caused by Fusarium oxysporum, Rhizoctonia solani and F. solani cause severe damage to tomatoes and is very difficult to manage because the fungi are soil-borne and seed-borne and persist in the soil. The objective of the present work is to control wilt and root rot diseases on tomato by some biotic and abiotic substances in vitro and in vivo. 44 isolate of F. oxysporum, R. solani and F. solani were collected from diseased tomato plants at twelve governorates from Egypt. All tested isolates had a pathogenic effect and varied in their virulence. Kleen-14, Sakha -16 and Tanta -8 isolates of F. oxysporum, R. solani and F. solani were significantly most aggressive isolates which caused the highest disease severity (D.S) on tomato plants, in order. The least F. oxysporum, R. solani and F. solani wilt and root rot (D.S) were recorded onto Gondlina tomato cultivar. Meanwhile, Collina recorded the highest D.S compared with Super Strain B. All tested antagonistic treatments including bioagents, biocides (Bio-Arc, Bio-Zeid), chemical inducers and plant oils as well as fungicides Topsin-M (70%), Vitavax-200 significantly reduced the disease severity under greenhouse conditions. Among all treatments in greenhouse studies, Bio-Zeid and Bio-Arc were the most effective substances in controlling wilt and root rot diseases

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