Watermelon (Citrullus lanatus Thunb.) is one of the most important vegetable crops in Egypt. It's now considered as one of the cash crop besides being a lovely summer fruit. It is important to report that El- Nubaria is one of the most important producing regions for such crop, but soil-borne diseases resulting from the frequent cultivation of watermelon in the same area is a limiting factor. However, the famous varieties which are grown in Egypt are "Aswan F1 and "Tawos F1." Most varieties deteriorated as a result of the infection by disease pathogens, where land use is very intensive and...