Farmers use predators to control pests. Predators are animals that naturally eat or kill other animals, and when they are introduced into a crop or garden, they can help to reduce the population of pests that can damage or destroy the plants. This approach is a form of biological pest control, which aims to use natural predators or other living organisms to control pests, rather than relying on chemical pesticides that can harm the environment and human health. By using predators, farmers can reduce their dependence on pesticides and create a more sustainable and eco-friendly approach to farming.