الفهرس 
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Abstract
Tomato plants in Egypt are exposed to infection with many soil fungi that lead to a decrease in crop productivity. Usually, such diseases are mainly controlled by fungicides, while their use negatively affects the environment and public health. Therefore, this study was conducted for the purpose of exploiting the methods of Another control as an alternative to traditional chemical treatment. The most important of these methods is biological control of fungal pathogens, but recently it was found that silver nanoparticles are the latest methods of controlling root rot fungi.
1. Isolate the root rot fungi that infect tomato plants, then carry out the purification process and test which one is the most satisfactory, then define the most satisfactory isolate on tomato plants.
2. Production of silver nanoparticles using T. harzianum and its use as an antifungal for root rot fungi, which is caused by fungal infection by F. solani and M. phaseolina. These particles were produced and characterized using SEM devices.
3. Conducting a laboratory experiment on six nanomaterials to prove which of them is more efficient against fungal pathogens using agar well diffusion technique.
4. Evaluation of several concentrations of silver nanoparticles (50-100-150-200) mg / liter as well as recommended concentrations of the fungicide Vitafax (5.-1-1.5-2) g / liter in addition to the use of B. subtilis - T. harzianum.
5. A pot experiment was conducted for tomato plants, class 023F1 in the direction of the Faculty of Agriculture, Department of Agricultural Plants, Kafr El-Sheikh University, and the results were taken after (30-45-60-100) days of seedling and other paper samples were taken at the age of 20-40 days to conduct molecular studies.