What are biological control agents?

Biological control agents are specifically defined as predators, parasites, and pathogens that help to manage pest populations in an ecological and sustainable manner. These agents work by naturally regulating the abundance of pest species, thereby reducing the need for chemical pesticides. This approach to pest management emphasizes ecological balance and can lead to long-term control of pest populations without the negative side effects associated with synthetic chemicals. Utilizing biological control agents can also support biodiversity and promote a healthier ecosystem.

The other options do not accurately define biological control agents. Chemical pesticides are synthetic substances designed to kill pests, which contrasts with the natural processes involved with biological control. The definition of all living organisms in an ecosystem is too broad and encompasses more than just those that function as biological control agents. Mechanical devices focus on physical methods of pest control, which is another form of management that is distinct from the biological approaches.