Mycorrhizal research has grown by leaps and bounds in the past few decades. These fungi promise to promote plant growth, maintain plant and soil health, assist in bio-protection against root diseases, production with reduced fertilizer and pesticides & nutrient acquisition, affect soil skeletal structure holding primary soil particles together, are conducive to formation of microaggregate structures, higher rhizosphere population, symbiosis alters host water relations, alter root length and architecture. The mechanisms by which fungi induce resistance in their hosts and enhance disease resistance need critical evaluation and examination. Editors see this volume as a tremendously valuable collection of specialized up-dated chapters describing the state-of-the-art and modern protocols in mycorrhizal research, seriously presented and synthesized.