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Biological control, or biological pest control, is the reduction of pest populations by using natural enemies. It is important because crop pests become resistant to chemical pesticides.
Natural enemies of insect pests include predators, parasitoids, and pathogens. Biological control agents of weeds include herbivores and plant pathogens. Predators, such as birds, lady beetles and lacewings, are free-living species that eat many prey during their lifetime.
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