biological pest control, definition of

a method of controlling pests (including insects, mites, weeds and plant diseases) that relies on predation, parasitism, herbivory, or other natural mechanisms.

• Praying mantises hunt down and eat small birds, including hummingbirds
  We know praying mantises are carnivorous – they’ve been documented consuming frogs, lizards, and snakes. But they also kill and consume small birds like hummingbirds, according to new research from zoologists in Switzerland and the United States....
• Virginia Tech Biological Pest Control in India Saves Farmers $309 Million
  The papaya mealybug is a particularly nasty pest that rips through papaya, eggplant, and tomato crops in southern India, but it's hard to control since it is resistant to conventional pesticides...