Moths & butterflies known to feed on western red cedar (Thuja plicata):
| Species | Status | Match |
|---|---|---|
| Juniper pug Eupithecia pusillata |
Vulnerable | any Thuja species |
| Freyer's pug Eupithecia intricata |
LC | this species |
| Dwarf pug Eupithecia tantillaria |
LC | this species |
| Scalloped hazel Odontopera bidentata |
LC | this species |
| Spruce carpet Thera britannica |
LC | this species |
| Grey pine carpet Thera obeliscata |
LC | this species |
Host-plant data: Cook et al. (2025), Traits data for the butterflies and macro-moths of Great Britain and Ireland, 2024, UK Centre for Ecology & Hydrology / Butterfly Conservation; and Padovani et al. (2020), Database of Insects and their Food Plants (DBIF), UK Centre for Ecology & Hydrology (both Open Government Licence). Contains data supplied by UK Centre for Ecology & Hydrology.