To reduce the likelihood of carpenter ant invasion, what should be done?

Keeping wood mulch at least 1 foot away from structures is a highly effective preventative measure against carpenter ant invasions. Carpenter ants are attracted to moist environments and decaying wood. When wood mulch is in close proximity to a building, it provides the ideal conditions for these ants to thrive, as it retains moisture and can harbor rot. By maintaining a distance of at least 1 foot between wood mulch and the structure, the likelihood of creating a conducive environment for carpenter ants is significantly reduced.

This preventive measure not only minimizes access points for these pests but also helps in maintaining better airflow around the foundation of the building, which can further deter moisture accumulation and potential infestations. Other options may not proactively prevent carpenter ants or could even support their presence in the area, making this choice the most effective for reducing the risk of invasion.