This book is specially prepared for students of undergraduate and post-graduate programmes of study in fields of Biology, Botany and Plant Pathology. The coloured plates, figures and tables are properly illustrated to depict plant disease symptoms for the purpose of clarity and easy comprehension by students, lecturers and researchers in the aspects of etiology, epidemiology and management of plant diseases. Common examples of plant diseases of fungal, bacterial, nematode and protozoan origin are also documented.