This book offers an in-depth exploration of phytopathogenic fungi within the context of agroecology, providing essential insights for understanding and managing these critical organisms. Each chapter begins with a comprehensive information panel that introduces the pathogen, detailing its taxonomy, the diseases it causes, its pathogenic mechanisms, economic significance, and strategies for identification and control. By equipping researchers with this knowledge, the book empowers them to manipulate these fungi to meet their specific needs. Key concepts covered include the taxonomy and life cycles of various fungi, the economic impact of fungal diseases on crop yield, and innovative control measures. The book's expert contributors provide a thorough analysis of each pathogen, making it an indispensable resource for anyone involved in plant health and disease management. This volume is the first in a three-part series that will cover a total of 104 plant pathogens, including bacteria, viruses, viroids, and nematodes, highlighting their economic importance in agriculture. This book is an invaluable resource for postgraduate students, research scholars, post-doctoral fellows, and educators in fields such as Plant Microbiology, Plant Pathology, Entomology, Virology, and Nematology. It is a must-read for those seeking to deepen their understanding of plant pathogens and their impact on agriculture.