In this book, attempts have been made to deliver the core of the subject in a concise, easily assimilated form designed to compete the JRF, SRF, NET and ARS. It may be useful to seek admission in Ph. D. in Plant Pathology through entrance examinations of various institutions and get through screening tests conducted by Public Service Commission of various states for jobs in Plant pathology/Plant Protection. This book covers all the chapters of plant pathology including historical background, molecular plant pathology, breeding for resistance to disease, physiology of diseased plants, root diseases, seed-borne diseases, postharvest diseases of fruits and vegetables, diseases caused by fungi, bacteria, viruses, viroid, virusoid, phytoplasmas, spiroplasmas, protozoa and abiotic stresses etc. It contains objective questions with answers to be asked in various competitive exams. This book is designed to satisfy the needs of students preparing for competitive exams and to understand the fundamental aspects clearly and easily.