Which of the following is an example of a physical pest control method?

Using nets or barriers to keep pests out is a prime example of a physical pest control method because it involves creating a physical obstruction that prevents pests from accessing plants, buildings, or other areas where they may cause damage. This method is non-chemical and relies solely on physical means to deter or exclude pests.

Physical pest control methods focus on non-invasive strategies to manage pest populations, which can be beneficial in reducing reliance on chemical treatments and minimizing environmental impact. By using barriers like nets, screens, or fences, you can physically block pests from entering targeted areas. This approach not only protects plants and structures but also helps to maintain a more balanced ecosystem by avoiding the potential negative effects of chemical pest control methods. It is particularly effective for managing certain pests, such as birds, insects, and small mammals.

Other options involve chemical or biological approaches. Spraying insecticides introduces chemicals into the environment, releasing predatory insects involves biological control methods, and utilizing pheromone traps centers around chemical attractants to manage pests. Each of these methods has its unique applications and benefits but does not fall under the category of physical control methods like barriers do.