Which of the following is an example of a mechanical control method?

Using traps or barriers to prevent pest entry is a clear example of a mechanical control method because it involves physical devices or structures to reduce or eliminate pest populations without the use of chemicals or biological agents. Mechanical control focuses on interrupting the pest life cycle or creating physical impediments to pest movement and access.

For example, traps can capture pests, while barriers such as screens or fences can prevent them from entering a specific area, thereby physically controlling their presence. This method is often highly effective for specific pests and is a preferred approach in integrated pest management due to its low environmental impact and the reduced risk of affecting non-target species.

In contrast, options involving pesticides, insect growth regulators, or biological control agents represent chemical and biological methods, which do not fit within the mechanical control category.