In recent years the disease problems in many crop plants attracted the attentions of the scientists to device newer techniques in an integrated approach. The book "Principles of Plant Disease Management" is prepared by integrating all the available approaches viz. description of plant diseases, organization of structure of plant pathogens, their physiology, reproduction and management etc means in managing plant diseases. This book will be useful not only to the students and researchers in the field of plant pathology, but also to the extension functionaries who concerned with disease management in the field.