الفهرس 
Introduction
Causal organismOnly 14 pages are availabe for public view
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Abstract
Rhizoctonia root rot disease is a serious and economically important disease for bean production in most of tropical, subtropical and temperate areas of the world where it is grown. Chemical control may be available to reduce the effects of Rhizoctonia root rot disease on young plants effectively and extensively, but field application of these chemicals may not always be desirable. Biological control using arbuscular mycorrhizal (AM) fungi was suggested in this work to overcome this problem. A field survey covering four districts in Dakahlia governorate representative for different ecological conditions was conducted to investigate the correlation between AM fungi and soil properties. Interaction between AM fungi as a bio-agent and Rhizoctonia root rot disease of common bean plant was investigated in this study under natural conditions in pot experiment. A mixture of Egyptian formulated AM (Multi-VAM) consists of propagated units of Glomus mosseae, Glomus intraradices, Glomus clarum, Gigaspora gigantea and Gigaspora margarita. On the basis of results presented here, it can be concluded that the application of AM fungi as a biocontrol agent played an important role in plant resistance against the infection with R. solani. Different physical and physiological mechanisms have shown to play a role in plant protection by AM fungi, namely, improved plant nutrition, improved plant growth, damage compensation, changes in the root system, increase cell wall thickening, accumulation of some antimicrobial substances (phenolic compounds and defense related enzymes) and activation of some plant defense genes.