The book’s content describes the history, biotic and abiotic stress of plant disease, types of plant disease, and its integrated management. The history of plant disease management shows the traditional, chemical and integrated approach to plant disease management. The abiotic means environmental factors while biotic include microbes, phanerogamic plants, viruses, nematodes etc. These abiotic and biotic factors cause several diseases in plants like necrotic symptoms, abnormal growth and development of plant tissues, gummosis, wilting, rust, mildew etc. A number of factors responsible for the transmission of these diseases are described in this book. Besides, disease triangle and disease cycle are also defined. Furthermore, disease diagnostic procedure has been given in fragments of sample collection method, sample submission method etc. Integrated disease management has been described here which comprises cultural, physical, mechanical, genetic, biological and chemical. Institutional, sociological, economic and political constraints in integrated disease management are also mentioned in this book.