Testing the effect of some essenstial oils on controlling of some causal pathogens of sugar beet plants in Nile Delta soil,( Sclerotium rolfsii Sacc.; Rhizoctonia solani Khun.; Fusarium oxysporum Schlech and Macrophomina phaseolina) (Tassi) Goid. In vitro, oils of Syzygium aromaticum L. (clove), Cuminum cyminum L. (cumin), Ocimum basilicum L.(basil) Mentha viridis (mint) were effective as inhibitors of the linear growth of S. rolfsii R. solani, M. Phaseolina at the concentration of 1500 ppm. On the other hand, they were affected slightly the linear growth and sporulation of F. Oxysporum  at the concentration of 2000 ppm. At the same time, increasing the concentration of the tested materials significantly reduced the linear growth of all the tested pathogens.           Under greenhouse and field conditions, data show that oils have significant effect in improving the number of survived seedlings and reduce of root rot. Oils of Syzygium aromaticum L. (Clove) and Cuminum syminum L. (Cumin) were suprior than the other materials in reducing infection with pre- and post damping - off and root rots of sugar beet as well as the disease severity. The rest oils were less effective in decreasing the disease incidence. Oils improved morpholigical characters expressed as plant height, Leaf area and dry weight per plant,  also increasing the yield component, total soluble sugars (TSS), sucrose percent in root and sugar purity.          The fungicide Rizolex T. 50 was used for comparative studies in controlling these diseases.