What does host resistance or genetic control involve?

Host resistance or genetic control refers to the strategy of enhancing the natural defenses of host organisms—such as plants, animals, or humans—against pest infestations or diseases. This approach focuses on selecting or breeding individuals with favorable genetic traits that confer resistance, thereby reducing the susceptibility of the host to pest attacks. By improving the health and resilience of the host, biological control mechanisms can be activated, allowing the host to better withstand pest pressures without relying solely on chemical or artificial interventions.

The other options present methods that do not align with the concept of host resistance. Using synthetic chemicals typically involves direct intervention that can suppress pests but does not enhance the host's natural defenses. Employing invasive species could disrupt local ecosystems and potentially introduce new challenges rather than strengthening the existing hosts. Developing mechanical traps involves physical means to eliminate pests but again does not contribute to the inherent resistance of the host itself. Thus, focusing on the genetic control of host resistance effectively addresses the issue of pest management at a foundational level.