Plant pathology is the scientific study of diseases in plants caused by infectious organisms and physiological factors. Plant disease is an impairment of the normal state of a plant that interrupts or remodels its primary functions. All species of plants are prone to diseases and their occurrence and prevalence vary from season to season. They also depend on the presence of the pathogen, environmental conditions, and the crops and varieties grown. Plant pathology deals with the study of pathogen identification, disease etiology, disease cycles, economic impact and plant disease epidemiology. The topics covered in this extensive book deal with the core subjects of this discipline. It will also provide interesting topics for research that interested readers can take up. Students, researchers, experts, and all associated with plant pathology will benefit alike from this book.