How can dust baths, sunlight, and wetting reduce louse populations?

Dust baths, intense sunlight, and continuous wetting are natural mechanisms that help control populations of lice. These environmental factors act as external stressors that can disrupt the survival of lice and their eggs on a host.1

While lice are typically adapted to thrive within the warmth and darkness of a host's plumage or pelage—often being repelled by light—exposure to intense sunlight can create an unfavorable environment for them. Similarly, dust baths and continuous wetting serve as physical interventions that interfere with the louse's ability to maintain its habitat on the host. These methods, alongside the host's own grooming and preening behaviors, are essential for keeping louse populations significantly lower than those found on sick or compromised animals, which may lack the ability to perform these self-maintenance activities.12