Understanding microbes is vital to the past and future of mankind and our planet. Without microbes life is impossible on the earth. Research and biotechnological applications of microbes is a fascinating field of science and increasing being seen as a mainstream tenet of biology. The present book focus on mycorrhizal fungi promise to promote plant growth, maintain plant health, bio- protection against diseases, production with reduced fertilizer, pesticides and nutrient acquisition. The book for researchers and students involved the study of symbiotic microorganisms and plant microbe interactions. The book will be useful for the basic research, biotechnological applications and development of commercial products.