الفهرس 
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Abstract
The present study aimed to prove the possibility of using plant volatile oils of; Menthalongifolia and Origanumvulgare, plant fixed oils of;Plantagoovata and Lepidiumsativum,plant acetonicextracts of;Origanumvulgare,Rheum palmatum,Quercusinfectoria andWithaniasomnifera,entomopathogenic fungus, biozed anduniconazole as a plant growth regulatoras alternatives to conventional insecticides on a pest of economic crops in Egypt, the cabbage aphid, B. brassicaeunder laboratory conditions. The phytochemical studies of volatile oils, fixed oils and two isolated compounds,phthalic acid di- octyl ester and4,5-Dihydroxyanthraquinone-2-carboxylic acid(Rhein)from acetonic extracts of O.vulgare and R.palmatum, respectively were investigsted.All LC50streatments showed highly toxic effect against the adult of cabbage aphid. The mortality percentages of B. brassicae were gradually increased by the time elapsed to reach its maximum after 6 days.All the treatments reported highest repellency effect.The treatments affect some biological aspects of B. brassicae. AllLC50s treatments decreased the duration of apterousB. brassicaethan control and so resulted in a decrease of the aphid’s injury caused to cabbage crop. The longevity of adult aphid was highly significance decreased by all treatment compared with the control (9.05) days.Also, morphogenic aberrations were noticed in adults. In addition, the disturbance in activities of AST, ALT, amylase, invertase, trehalase, ALP and ACP,α and β estrases enzymes which cause physiological imbalance led to death.Our results confirm the hypothesis that fungi(biozed) infection increased the level of oxidative stress in the adult midgut. In light of this study, it seemed possible that oxidative damage contributed to cell death in themidgut during infection.Ultimately, the histological and ultrastructural changes in midgut and ovary of cabbage aphid, B. brassicae were also studied.