Head to head
Eastern Subterranean Termite vs Western Drywood Termite
The eastern subterranean termite and the western drywood termite represent two fundamentally different termite lifestyles, one built entirely around soil moisture and the other entirely independent of it.
| Eastern Subterranean Termite | Western Drywood Termite | |
|---|---|---|
| Scientific name | Reticulitermes flavipes | Incisitermes minor |
| Soil contact required | Yes, constant | None |
| Typical colony size | Hundreds of thousands | A few thousand |
| Telltale sign | Mud shelter tubes | Six-sided faecal pellets |
| Swarm timing | Spring | Late summer, early autumn |
| Typical treatment | Soil-based treatment | Whole-structure fumigation |
| Primary range | Eastern United States | California, southwestern US |
| Conservation status | Least Concern | Least Concern |
Eastern Subterranean Termite vs Western Drywood Termite: common questions
Why does one termite need soil and the other doesn't?
The eastern subterranean termite relies on constant contact with moist soil as its primary source of the moisture its colony needs to survive, while the western drywood termite draws what little moisture it needs directly from the dry wood it feeds on and the surrounding air, an adaptation that lets it establish colonies entirely above ground with no connection to soil at all.
How can you tell which termite species is infesting a building?
Mud shelter tubes running along a foundation or wall strongly indicate the eastern subterranean termite, since it must build these tubes to travel safely above ground, while small piles of hard, six-sided faecal pellets beneath infested wood point to the western drywood termite, which pushes waste directly out of the wood through small openings rather than building any external tubes.
Why does the western drywood termite need fumigation while the subterranean species doesn't?
Because the western drywood termite can establish hidden colonies deep within structural wood with no external soil connection, ground-based treatments that work against the eastern subterranean termite simply cannot reach it, making whole-structure fumigation, commonly called tenting, the more reliable method for eliminating a drywood infestation that cannot be easily located or accessed directly.