This book discuss about principles and techniques of isolation, characterization & identification of phyllospheric micro-organism. Effect of pollutants on micro-organisms was also been discussed in the book. Attempt has been made to identify specific properties of micro-organisms such as N-fixation, Phosphate solubilization & cellulose decomposition and test their efficiency in laboratory & field condition. This book is useful for students, researchers and scientists, who are interested in deeper study in phyllospheric microbial community.