الفهرس 
The host , the pathogen and the diseaseOnly 14 pages are availabe for public view
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Abstract
Onion (Allium cepa L.) is one of the most important crops in many countries of the world including Egypt. It is used in preparation of different foods, and is the most reputable medicine in the world. It is rich in flavonoids benefits to human health onion is attacked by several diseases at all stages of growth, where white rot disease is the most destructive one causing tremendous quantitative and qualitative losses Allium white rot of onion caused by the soil borne fungus Sclerotium cepivorium, is one of the most important diseases wherever Allium crops are grown and is an economically limiting factor in production areas around the world . After in vitro and in field studies on Sclerotium cepivorium the author notchied that :- - Fertilization of calcium super phosphate before transplantation at rate 150kg / fed and fertilization with potassium sulphate at rate100 kg/ fed adding at twice 30 and 45 days after transplantation reduced percentage of infection in onion white rot. - Planting onion after rice significantly decreased disease incidence of white rot on onion. This was followed by maize or soybean as a summer crops. - The addition of mature compost to soil alone or combined with amendiments (gool as aherbicide, sulpher ,Trichoderma veride or humic as asoil fertilizer) were decreased percentage of onion infection white rot at transplantation and the best treatment was addition of the compost with gool as aherbicide at transplantation. - Folicure is the best fungicide to control white rot of onion.