Which of the following are examples of prevention/mechanical barriers in pest control?

Screens and netting serve as effective prevention or mechanical barriers in pest control by physically blocking pests from entering a given area or accessing specific plants. These barriers are designed to prevent pest entry without the use of chemical agents, making them a safe and eco-friendly option. By implementing such barriers, gardeners and farmers can reduce pest populations and lower the risk of pest-related damage to crops while promoting sustainability.

In contrast, biological predators involve the use of natural enemies to control pest populations, which is a different strategy altogether. Chemical pesticides refer to substances that kill or repel pests but do not offer prevention through a physical barrier. Bait traps, while useful for monitoring or reducing pest populations, work on a different principle by attracting and capturing pests rather than preventing them from accessing an area. Thus, screens and netting stand out as the correct examples of prevention or mechanical barriers.