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Synopsis Acarines are prominent pests of field crops, granaries, warehouses and animals (arthropods, birds) causing heavy financial losses. House dust acarines are notorious agents of allergic reactions in human beings and other mammals. Acarines because of their small size and cryptic habitat are difficult to detect and hence most of the time infestations are overlooked. Once established in a new area, certain biological characteristics like high fecundity, various modes of reproduction, short life cycles, a myriad of dispersal techniques and adaptability to diverse ecological conditions allow rapid escalation to pest status. On the other hand, acarines are among the major resources for biological control of various classes of pests including insets, nematodes and weeds. These widely distributed microscopic animals ranging from free living to parastic forms and terrestrial to aquatic forms require specialized techniques for handling. The literature regarding their biodiversity, collection, rearing, biology etc. are scattered and most of the time unavailable to scientists interested to work on them. Hence, a comprehensive book on agricultural acarology is prepared which covers all aspects of acarine biodiversity, acarological techniques and their role as bio-control agent in an abridged form. The book is divided into three sections- 'Acarine biodiversity', 'Acarological techniques' and 'Acarines as biocontrol agents'. Acarine biodiversity contains six chapters, one each on plant, stored, soil, house dust, parastic and water mites. In second section, details on techniques of collection and extraction, preparation and mounting, labeling and housing the collection, culturing, counting and bioassay are given in individual chapters. Information related to predatory potential of acarines against insects, nematodes and weeds in included in third section in three chapters. The book has been liberally furnished with illustrations for better understanding. An extensive list of references and glossary are also provided at the end of the book.