Phytopathogenic Prokaryotes, Volume 1, provides an understanding of the diversity and complexity of diseases caused by phytopathogenic prokaryotes. It is part of a two-volume treatise that summarizes current research on these organisms. The book is organized into four parts. Part I covers the physical nature of prokaryotic phytopathogens as well as how they are presently classified, the limitation of this artificial classification, and the biology of the pathogen's invasion of plants. Part II presents conceptual hypotheses for the formation of the agricorpus (pathogen/host complex as a biological unit) and how this association may be detrimental or beneficial to both members of the unit. Other topics include the basic determinant of evolutionary change (the gene), and the evolution of vectors for dispersal of pathogens. Part III elaborates on the interaction at the plant/environment/pathogen interface (the plant surface). It presents information on the interaction of prokaryotes in the rhizosphere and phyllosphere, and how this interaction developed. Part IV shows how prokaryotes affect their hosts once infection has been established. This information is presented in sequence progressing from the disease-causing mechanisms of the facultative endophytic pathogens to those of the obligate endophytic pathogens.