Which factor is most essential for effective pest exclusion?

Effective pest exclusion primarily relies on sealing all entry points because this action directly prevents pests from entering a structure. When potential entry points such as cracks, gaps, and holes around doors, windows, pipes, and other structural openings are sealed, it significantly reduces the likelihood of pests being able to infiltrate the home or building environment.

This proactive approach not only stops pests from getting inside but also helps to maintain a clean and safe environment by minimizing the need for reactive measures, such as chemical treatments. In contrast, providing shelter for pests or increasing food supplies indoors would encourage pest infestations rather than prevent them. Frequent application of insecticides, while useful in managing existing populations, does not address the fundamental issue of pest entry. Hence, sealing entry points is the most effective and essential strategy for pest exclusion.