How do physical barriers function in pest management?

Physical barriers function in pest management by limiting the access of pests to plants. These barriers, which can include fences, nets, or row covers, serve to create a physical obstruction that prevents pests from reaching the plants. By blocking the entry points used by insects or larger animals, these barriers help to protect crops and other plants from damage and establish a crucial line of defense in integrated pest management.

The use of physical barriers is a proactive measure that not only reduces the risk of infestations but also can reduce the need for chemical treatments, although this isn't the primary function. Furthermore, while they can be effective against a wide range of pests, their effectiveness can vary depending on the type of pest and the barrier design. However, the essential purpose of these barriers remains focused on restricting pest access, hence their classification as a physical management strategy in pest control.