The organisms which can cause diseases or infections are referred to as pathogens. The scientific study of diseases in plants that are caused by pathogens and various physiological factors is referred to as plant pathology. Some of the organisms that can cause infectious diseases are viruses, bacteria, protozoa, nematodes, phytoplasmas, fungi and oomycetes. Plant pathology deals with pathogen identification, disease cycles, disease etiology, disease resistance and plant disease epidemiology. The physiological plant disorders which are caused by natural processes such as frost, snow, drought and flooding are also studied within this field. The topics included in this book on plant pathology are of utmost significance and bound to provide incredible insights to readers. It brings forth some of the most innovative concepts and elucidates the unexplored aspects of this field. Those in search of information to further their knowledge will be greatly assisted by this book.