How is mechanical control of insects executed?

Mechanical control of insects is executed through the use of physical means such as traps and barriers. These methods do not rely on chemicals or biological agents, making them an effective part of an integrated pest management strategy. Traps can actively catch or kill pests, while barriers, such as row covers or nets, physically prevent insects from reaching plants. This approach is particularly valuable as it minimizes the risk of chemical resistance, reduces the impact on non-target species, and often poses less risk to human health and the environment compared to chemical control methods.

In contrast, the other options involve methods that are not considered mechanical control. The application of chemicals refers to chemical control methods, introducing natural predators falls under biological control, and planting pest-resistant crops is a form of cultural control. Thus, while all are valid pest management strategies, they do not represent mechanical control.