Plant pathology is an interdisciplinary subject area which incorporates theories and applications of botany, microbiology, genetics and ecology to study diseases of plants caused by pathogens and environmental factors. This book includes some of the vital pieces of work being conducted across the world, on various topics related to plant pathology. This book brings forth some of the most significant concepts and elucidates the unexplored molecular, physiological and ecological aspects of plant pathology. It covers disease epidemiology, clinical analysis of diseases, evaluation of pathogens and crop loss assessment. This book is a complete source of knowledge on the present status of this important field.