Comprehensive Description

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General Description

The adult is easily recognized by the strongly sinuous margin of the costal margin. The forewing is light to dark purplish brown with darker fine brown to reddish brown thin lines and reticulations. The lines in the basal and median areas are more distinct than the others and sometimes border more darkly shaded areas. The edge of the costa and fringe is typically darker as well as a small thoracic scale tuft.  The similar Choristoneura rosaceana has a less sinuous costa, is normally larger and has relatively longer wings with more distinct banding. The late instar larva is pale green with a faint darker green dorsal stripe and sparse long setae throughout. The head is black or brown and the thoracic shield is ringed with black or brown along the posterior and lateral edges that fades to green towards the anterior. The distinctive pupa is whitish green with dark bars on its back (Chapman & Lienk 1971).


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© University of Alberta Museums

Source: University of Alberta Museums

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