Plant growth promoting microorganisms (PGPM) have gained acceptance and importance due to their dual benefits of promoting plant growth in addition to managing plant pests and diseases and are extensively used as microbial inoculants in improving agricultural productivity. Successful greenhouse and field demonstrations have been done using PGPM for growth promotion and resistance induction in various crops, against a broad spectrum of pathogens. Practical use of PGPM-based products has advanced and many formulations are made available in commercial scale, and more are currently under development. Microorganisms constitute the major players in the rhizosphere and their composition and biomass significantly alters the plants response to the environment. Composition and interaction of rhizomicroflora with its surroundings highly influences plant health and productivity. This book presents a methodical, comprehensive and latest research survey in this area. An overview of the scale and impact of PGPM in plant growth promotion and management of crop diseases, focusing attention on details most relevant to the development and application of biological control strategies involving various microbial strains is discussed. Problems and prospects of commercialization, advantages and disadvantages of their use and their potential for integrated pest management are also outlined. Most of the available books either refer to the subject of plant growth promoting fungi or plant growth promoting bacteria, however, this comprehensive book includes research pertaining to all beneficial microorganisms that are plant growth promoting in nature. Moreover, this is a rapidly developing field of research and has global impact. Therefore, keeping in pace with the latest developments in this area is totally necessary, and this book will be a latest and up-to-date compilation of the research from different parts of the world.