Which strategy involves using fences and nets in pest management?

The correct answer involves mechanical control because this strategy focuses on physical methods to manage pest populations. Using fences and nets is a classic example of mechanical control, as these barriers physically prevent pests from entering certain areas, such as gardens or crops. By employing physical structures to block access, this method directly reduces pest damage without introducing chemicals or biological agents into the environment.

In contrast, biological control would involve the use of natural predators or parasites to manage pest populations, which is not relevant to the physical barriers mentioned. Cultural control focuses on practices that enhance crop health and reduce pest attraction, such as crop rotation and sanitation, rather than physical barriers. Chemical control relies on the use of pesticides or other chemicals to eliminate pests, which is again different from the use of physical barriers like fences and nets. Thus, the characterization of mechanical control fits perfectly with the use of fences and nets as a method of pest management.