The larvae feed on the needles of Abies grandis, Abies amabilis, Abies lasiocarpa, Pseudotsuga menziesii and Pseudotsuga menziesii var. glauca, Tsuga heterophylla, Tsuga mertensiana, Thuja plicata, Picea sitchensis and Pinus contorta var. latifolia. Full-grown larvae reach a length of 20 mm. There are two colour morphs. The common morph is green with a yellowish green head. The second morph is brown. Larvae can be found from April to early June and again from mid August to October. Pupation takes place in early June.
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