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

In the present study plant extracted (Syzygium aromaticum, Foeniculum vulgare, Zingbiber officinale, Linum usitatissimum and Ocimum basilicum) were extracted either by hexane or acetone. Also Commercial essential oils for the same plants and Vertimec acaricid, were tested against Tetranychus urticae Koch eggs and adults and Phytoseiid predatory mite Phytoseiulis persimilis by using spray technique. The S. aromaticum hexane extract against eggs and adult female of T. urticae flowing by all tested plant extracts. Results revealed that LC50 value of S. aromaticum acetone extract was more toxic than all plant extracts against T.urticae eggs and adults. The mortality percentage for P. persimilis using acetone extract, recorded that S. aromaticum caused high toxicity against P. persimilis followed by the other plant extracts. The S. aromaticum essential oil exhibited a high degree of efficiency against eggs and adult female of T. urticae.The LC50 value of the biocide (vertemic) against T. urticae adult were 0.0005 ml/L. The Identification was carried out using GC/MS analysis, as mentioned before in material and methods. Eleven compounds were identified by comparing with instrument database library. Thin Layer Chromatography, (TLC) was used to separate and isolate of various compound present in experimental clove hexane extracts of S. aromaticum, three compounds Eugenal, Caryophyllene and Eugenyl acetate were identified by comparing with instrument data base library. The effect of plant hexane extract and essential oil of S. aromaticum clove were investigated on life-table parameters of T. urticae . Life table parameters show significant reduction in rm , Ro and n. Both plant extract and essential oil of S. aromaticum caused a reduction in longevity and survival from 0.24 in control to 0.19 female/ day

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