الفهرس 
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Abstract
ABSTRACT
Tomato plants are subject to infection by many fungal pathogens. fusarium wilt disease is among the important diseases that attacking tomatoes. Fusarium oxysporum is a soil borne fungal pathogen that infects plants through roots at all stages of plant growth, causes major economic losses by inducing necrosis and wilting symptoms in many crop plants. fusarium wilt disease were collected from different tomato locations of six Egyptian governorates i.e., EL- Behaira, Minufiya, El Qalyubia, Giza, Kafr El-sheikh, and Sharkiya during the 2017 and 2018 growing seasons. The causal of fusarium wilt was isolated from stem vascular discoloration diseased plants. The pathogenicity test of six isolates of F. oxysporum was carried out using transplants of tomato hybrid Super Strain B. Results show that the highest pathogenic isolate was FOL-5 which isolated from Kafr El-sheikh samples where it caused the highest percentage of disease incidence. AgNPs synthesized by three different methods by biological, plant extract and chemical. The synthesized silver nanoparticles were characterized with transmission electron microscopy (TEM), Dynamic Light Scattering nano sizer (DLS) and Zeta potential. Grafting plays an important role in the management of Pathogens infecting root and stem as this technology can be quickly deployed without causing significant changes in farming operations. Grafting vegetable crops is common to control fusarium wilt (caused by Fusarium oxysporum f.sp. lycopersici). Results revealed that plants treated with silver nanoparticles exhibited an increase in activities of defense enzymes such as peroxidase, polyphenol-oxidase, chitinase, phenylalanine ammonia and phenol contents over the control plants. In this respect, and reduced the diseases severity and diseases incidence. Results revealed the biological and plant extract method is better th