الفهرس 
INTODUCTIONOnly 14 pages are availabe for public view
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Abstract
Tomato (Solanum lycopersicum L.) is an important vegetable crop for providing vitamins, minerals and fiber in human foods all over the world, commercial open field production of tomato is limited by Late blight disease, which caused by Phytophthora infestans is one of the most devastating diseases of tomato. This pathogen attacks the leaves, stems and fruits. Under favorable conditions, it can lead to total crop destruction. A total of 264 isolates of P.infestans were isolated from infected tomato plants. The isolates were obtained from major tomato growing areas in deferent location in Egypt between seasons 2007 and 2013. Although a large number of synthetic fungicides have been recommended to control this pathogen, most of them have proved to be carcinogenic and the pathogen develops resistance quickly. In this study, 2 species of Trichoderma fungi were isolated from the rizhosphere of tomato plants and tested in vitro and in vivo(as biocontrol agents) for their ability to control the causal pathogen. Moreover, seeds water extracts of 3 Egyptian medicinal plant species khella (Ammi visnaga), Mustard (Sinapis alba), and Garden Cress (Lepidium sativum) were tested as biofumigants. These extracts were analyzed by GC-MS analysis. The values of isothiocyanates content were 2970, 1560 and 1800 Mg/L, respectively. Several experiments were carried out on the effect of these components on P. infestans in vitro and under open field condition.