One of the major difficulties in the biological control of insect pests is that

The predator develops a preference to other diets and may itself becomes a pest; is one of the major difficulties in the biological control of insect pests. Biological control is a component of an integrated pest management strategy reduces the pest populations by natural enemies and typically involves an active human role. Natural enemies of insect pests, also known as biological control agents, include predators, parasitoids, and pathogens. Biological control of weeds includes insects and pathogens.