Synopsis India has made rapid strides in the field of agricultural research and education. Green revolution witnessed the use of plant protection umbrella for new varieties and hybrids. Plant pathology has been an integral part of plant protection. In agricultural universities separate departments came into existence. The courses encompass all the branches like Mycology, Bacteriology, Virology and Nematology. This book has been formatted to cover several aspects of plant pathology to cater to the need of students at graduate and post-graduate level. Several courses are offered at graduate level and it is difficult to have separate books for each course. Therefore, a broad treatment of the subject has been given here to cover wide-range of topics. Beside general plant pathology major emphasis given.