Acquiring knowledge about different aspects of entomology is of vital importance in adopting appropriate measures for the control of pests and also for utilizing the beneficial insects for the benefits of man. This book deals with the basic concepts of entomology, which include: - Morphology, anatomy, adaptation and classification of insects, especially the parasitic ones, which do harm to plants, livestock and even to man. Economic role of insects with special reference to productive ones such as, honeybee, silk worm and lac insect as well as beneficial ones such as, parasitoids, predators pollinators etc. Pest management that covers usage of various plant protection chemicals, plant protection equipments, toxicology of pesticides, compatibility of pesticides etc. Non-insect pests viz., nematodes and mites, their economic role and control measures. The text is substantiated with many fine, hand-drawn figures and illustrations that will help better understanding of the text. The book, which is primarily intended for the undergraduate students of agriculture, will be of use to the postgraduate students of agriculture, to the officials working in the department of agriculture, especially those involved in plant protection work and also to the elite public who are interested in scientific agriculture.