There is great economic importance in producing disease-free plants, and as diseases are a major cause of plant disease internationally, an introduction giving an understanding of plant viruses is a useful resource for the study of this fundamental science. In this new edition, disease synptoms caused by plant viruses are described, followed by a description of procedures used to transmit viruses experimentally, virus purification and virus identification. The different ways in which viruses are transmitted biologically and plant virus epidemiology are discussed, as are the various methods used to control plant viruses. The final chapter is devoted to practical information and introductory exercises that will be of use to teachers for setting class practicals and to students in carrying out practical work. The book also includes a list of all plant viruses described to date and a glossary of plant virus terms.