The control of destructive organisms, esp. insects, by various, usually nonchemical means, as by the use of natural predators.
Webster's New World
Control of a usually nonindigenous pest by introducing an organism that is a predator, parasite, or pathogen of the pest species in its native environment.
American Heritage Medicine
Control of pests using natural predators, parasites, pathogens, or other organism(s) that harm the pest species.
Control of pests by disrupting their ecological status, as through the use of organisms that are natural predators, parasites, or pathogens. Examples of biocontrol include the use of ladybugs to prey on aphids and scale insects and the treatment of turf with spores of the bacterium Bacillus popilliae , which cause milky disease in Japanese beetle larvae.