In developing countries, the most important challenge is to produce sufficient food for the growing population from inelastic land, in this context mycorrhizal technology can be profitably utilized as bio-inoculants to agricultural and forest areas for better nutrient utilization and more effective land use. The objective of this book was to understand the developments and applications of arbuscular mycorrhizae. This book includes articles on various aspects of Arbuscular mycorrhizal fungi. Mainly focuses on Techniques for mycorrhizal fungi study, importance of AM fungi in nursery, forest ecosystems and in alleviating toxicity of polluted soils and role of root exudates in mycorrhizal association with plants. A critical review on Mycorrhizae as a bio-control agent in Disease management and molecular approaches for the mycorrhizal study were also included. This book will be of immense utility to the Scientists, Researchers, Academicians and Students engaged in AM fungal research.