الفهرس 
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Abstract
Faba bean (Vicia faba), tomato (Lycopersicon esculentum) and bean (Phaseolus vulgaris ) are three of the most important filed crops in Egypt due to their high nutritional values i.e carbohydrates, proteins, minerals and vitamins. Faba bean and bean are considered a primary source of protein in the human diet. Also consumers used their straw as animal feed. Moreover, tomato in considered as one of the most important cash crops in several countries. Plant diseases play a direct role in the destruction of natural resources in agriculture. Chocolate spot disease of faba bean caused by Botrytis fabae causes a great annual losses in faba bean yield and sometimes causes a complete crop failure. Also, wilt disease of tomato plants caused by Fusarium oxysporum f.sp. lycopersici causes great losses in tomato yield. Moreover, damping-off disease of bean plants caused by Rhizoctonia solani attacks bean seedlings at the ground level and grows downwards into roots and also damages any part of the seedling. So, control of these diseases is essential to obtain a great yield and improve the quality of these economic field crops. The widespread use of fungicides to control plant diseases has led to an increase of health hazards due to their phytotoxic residual and pollution effects, development of fungicidal resistance and adverse effects on growth and productivity of the host plant as well as on the accompanying microflora. So the biological control of plant pathogenic fungi has received a considerable attention as an alternative strategy. The• present study focused on the achievement of the following approaches:- I- Laboratory tests (in vitro). III- Chemical analysis studies. II- Greenhouse tests (in vivo). IV- Ultrasrtucture studies.