The book Plant Protection, Diversity and Conservation is a critical and comprehensive compilation of 52 chapters on various aspects of Plant Protection especially on insect pest, disease, nematode and weed, diversity, prevalence and conservation of beneficial insects, bioagents, parasites, parasitoids and predators and entopathogenic nematodes that control harmful insects. The book primarily meant for students, teachers and research scholars who are engaged in management through biotechnological and eco-friendly options.