الفهرس 
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Abstract
The present investigation is planned to study some items on the disease and its pathogen and the effect of fungicidal and fertilzation treatment on the disease severity. In addition, the relation between rhizosphere microorganisms and the pathogen is studied. The histopathological study is also planned to look for the mode of infection and the anatomical response of different onion varieties to fusarium oxysporum F.Cepa.