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Biological control is the use of beneficial organisms to help control pest organisms. These beneficial organisms are often referred to as “biocontrol agents” or “natural enemies.” Weeds, pest insects, and plant diseases are some of the frequent targets of biological control in agriculture. Natural enemies can themselves be predatory/parasitic insects (targeting pest insects), herbivorous (plant-feeding) insects (targeting weeds), or diseases (pathogens) of pest insects, weeds, or even other harmful plant pathogens.

Classical biocontrol is the introduction of natural enemies from...