The book is based on the latest syllabus of B.Sc. (Hons.) Agriculture programme, recommended by ICAR Fifth Dean's Committee. However, the book will also be useful for Horticulture, Forestry and basic science students especially those are studying Plant Pathology as a minor subject at UG or PG level. The book covers: Introduction, Fungi, Bacteria and Mollicutes, Viruses, Phanerogamic Plant Parasites, Nematodes, Growth and Reproduction of Plant Pathogens, Liberation/Dispersal and Survival of Plant Pathogens, Parasitism and Variability in Plant Pathogens, Role of Enzymes, Toxins and Growth Regulators in Disease Development, Defense Mechanism in Plants, Epidemiology, Principles and Methods of Plant Disease Management. The text is illustrated with diagrams, photographs and table for quick and easy understanding of the subject. Besides the entire syllabus, the book also contains competition corner: the key points, exercises (MCQs and match the following), and previous years questions useful for intensive and extensive drilling and reinforcement for the competitive examinations such as ICAR-JRF, ICAR-SRF, ICAR-NET, IARI, BHU, AO, AFO, Bank PO, IFS, CSE-UPSC, and other related exams.