Handbook of Biological Control is not a new subject; indeed it has been the focus of considerable research by pest control experts for some seventy to eighty years. It is defined as that method of pest control that relies on natural enemies-parasites, predators, and pathogens-to reduce pest populations to tolerable levels. We further define Handbook of Biological Control as a natural phenomenon, that component in the control of numbers of any organism, pest or otherwise, which is produced by its natural enemies.This book describes the ecological basis for the phenomenon of Handbook of Biological Control, its historical development by man, the nature of entomophagy with particular reference to insects that feed on other insects, procedures for carrying out programs of Handbook of Biological Control, and evaluation of any results attained. It goes on to describe factors that limit Handbook of Biological Control, to analyze selected case histories where this method of pest control has been attempted, and to show how Handbook of Biological Control contributes to integrated control. Although we have limited our coverage mainly to "classical Handbook of Biological Control, " as defined above, we mention briefly other biological methods of pest control, including host plant resistance, cultural control, the sterile-insect method, and genetic control of pests. The book then ends with a statement about the future of Handbook of Biological Control.
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