This book is prepared according to the contents of the course “Introduction to principles of pest and disease management” as per the recommendations of Fifth Dean’s committee on Higher Agricultural Education in India, for teaching in 2nd year of B.Sc. (Hon.) in Agriculture. The book contains 16 chapters, where detailed elaboration has been made about various principles of pest and disease management in a simple and easy language to give comprehensive information to the students of both under graduate and Post graduate level, teachers, researchers and readers. This book will be specifically helpful to the students studying B.Sc. in Agriculture for studying the course Principles of integrated pest and disease management.