Biological control in its simplest definition is the use of one organism to control another. More specifically it is the manipulation of populations of beneficial organisms to regulate populations of undesirable organisms. This course is designed to provide an overview of the field of biological control and its role in Integrated Pest Management programs. We will examine the diversity and sometimes bizarre interactions of insect parasitoids and predators with their hosts or prey. The methods and tools used in biological control will be surveyed. Current controversies in biological control will be reviewed, and we will conduct critical analyses of selected projects. Through the lecture and laboratory we will cover the basic conceptual and “hands-on” tools for approaching biological control research and for implementing biocontrol projects.