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Northern Prairie Wildlife Research Center

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Caterpillars of Pacific Northwest
Forests and Woodlands

Choristoneura occidentalis [Torticidae]


Usually yellow to yellowish green; subdorsally and laterally distinct paired white spots; tan head; black prothoracic shield. This species is a pest of coniferous forests in the western United States. It is very common on Douglas-fir, grand fir, and Pacific silver fir, during May and June.


Return to Photo Key to Species in Group B-1b - Spots, or streaks, or reticulated
Next Section -- Ypsolopha cervella [Plutellidae]

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