The entirety of this book, which contains 17 chapters, offers up-to-date information on various aspects of nematodes. These chapters cover topics such as nematode ultrastructural anatomy and morphology, phylogenetic and evolutionary concepts, nematode ecology and interactions with hosts, molecular and cytogenetic approaches, and more. The book is intended to be useful for teaching, research, and extension faculty in agricultural and horticultural universities, as well as state departments of agriculture, horticulture, forestry, sericulture, and fisheries, and plant protection organizations. The book also includes appropriate diagrams, tables, graphs, and illustrations, as well as a bibliography at the end of each chapter listing the references cited. This book will be a valuable resource for those interested in plant protection, including administrators, policymakers, and other concerned individuals.