The book “Plant Diseases: Diagnosis, Management, and Control” offers a comprehensive examination of the obstacles that plant diseases present to food security and agriculture. This book is an essential resource for students, researchers, and practitioners in the disciplines of agricultural science and plant pathology. It is designed to improve comprehension of the intricate relationships between pathogens, hosts, and environmental factors that contribute to the development of plant diseases. The book commences by categorising plant diseases into infectious and non-infectious categories, thereby clarifying the underlying causes and mechanisms of each. The biology of a variety of pathogens, such as fungi, bacteria, viruses, and nematodes, as well as their symptoms and effects on crop health, are all addressed in this work. This fundamental knowledge enables readers to precisely identify and diagnose plant diseases, which is a critical component of effective management. The book offers a variety of management strategies that are specifically designed to combat plant diseases, in addition to diagnostic techniques. It underscores the importance of integrated strategies that incorporate biological control, cultural practices, and the prudent application of pharmacological treatments. Readers can observe the implementation of these strategies in actual agricultural environments through practical case studies, which provide valuable insights into the most effective methods for disease prevention and control. In addition, the book speculates on the future of plant disease management, taking into account the effects of climate change, emergent pathogens, and technological advancements. It endeavours to motivate readers to implement proactive measures in their pursuit of protecting plant health by emphasising sustainable practices and innovative research.