Dampwood Termite

Dampwood termites in the genus Zootermopsis, primarily Z. angusticollis and Z. nevadensis, are among the largest termites in North America, with kings and queens reaching up to 25 mm as alates, and soldiers up to 20 mm. They are hemimetabolous insects, undergoing incomplete metamorphosis: egg, nymphal instars, and imago (adult). Nymphs can differentiate into various castes, including workers (pseudergates), soldiers, and reproductives, a process influenced by colony needs and pheromonal cues. Colony establishment typically begins with a primary reproductive pair, and development is slow, often taking several years to reach maturity, with mature colonies comprising several thousand individuals. These termites thrive in wood with exceptionally high moisture content – often above 25% – and are intolerant of desiccation, which dictates their harborage choices.

Dampwood termites are cryptic and eusocial insects, with colony activities primarily occurring within their wood galleries. Unlike subterranean termites, they do not construct mud tubes; instead, they maintain contact with their moist wood source internally. They feed exclusively on cellulose, digesting it with symbiotic protozoa and bacteria in their hindgut, excavating irregular galleries that follow the wood grain. Reproduction involves winged alates swarming, typically in the late summer or early fall evenings, attracted to lights, with dispersal flights usually occurring after rainfall. These primary reproductives pair off after shedding their wings and seek suitable moist woody substrates to initiate new colonies, communicating through pheromones to maintain colony structure and guide foraging.