The book provides the basic and emerging facts whereby its readers may be introduced to the scientific foundation of this noble course called Plant Pathogens and Principles of Plant Pathology The book fills up the gaps and helps its readers. The main features of this volume are as follows: 1. The subject matter has been presented systematically with suitable examples. 2. Efforts have been made to provide recent information. 3. The language is simple and easily understandable. 4. It covers, in its 41 chapters the major part of syllabi offered by Indian Universities especially in Plant Pathology. 5. The Glossary of technical terms has been presented at the end for ready reference.