The old addage "the enemy of your enemy is your friend" was never better illustrated than in the field of biological control. Based at Cornell University, this site contains information on the parasitoids, predators, and pathogens that attack insects that feed on crops and other plants favored by humans. New data is added regularly to this searchable site; users can select from any of the above-mentioned control agents and their modes of operation. Images and a glossary are provided. Biological Control provides useful information for persons with interests in agricultural pests, entomology, and organic gardening.