"Emerging and re-emerging viruses are a constant threat to plants. Despite intensive efforts to manage and prevent plant viruses and their potential vectors in crop production processes, many crops are damaged each year. This book, New and Emerging Plant Virus Sources: The Threat to Food Security, reviews the progress made to date and the challenges ahead in the field of plant viruses and agricultural production. The book covers various aspects of plant viruses in two sections: Different Sources of Plant Viruses Plant Virus-Host Interaction/Evolution This book sheds light on previously undiscovered plant viruses, bringing together information on the detection and tracking, host interaction, evolution, and management. Each section comprehensively covers plant viruses, focusing on their diversity and pathogenic expressions. The first section covers the various hidden sources of plant viruses such as from wild plants, weeds, and tobacco as well as other undetermined plant virus sources. The second section covers the implications of mixed infection on disease pathogenicity and epidemiology, provides an understanding of the virus and host relationship, and presents an overview of plant viruses from old to new. Providing new and important knowledge on major plant viruses and discussing their nature as well as impact on plants, this volume will be of special interest to research scholars, professors, and scientists working on plant and environmental viruses"--