E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Aplocera plagiata (Linnaeus, 1758)
St. John's Wort Inchworm; Treble-bar
Family: Geometridae
Photo of species

© Paul Westell  Email the photographer   (Photo ID #98062)

E-Fauna BC Static Map
Distribution of Aplocera plagiata in British Columbia
Details about map content are available here.


The St. Johnswort Inchworm was introduced in Canada in the 1980's as a potential biological control for the common St. Johnswort (Hypericum perforatum). "This species varies considerably in size (wingspan 37–43 mm) and colouration but is generally grey with three characteristic dark fascia across each forewing. The hindwings are pale grey or buff...The larva is also very variable, being green to reddish brown with alternating darker and lighter stripes." (Wikipedia 2012).

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
ExoticSNAExoticNot Listed
BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Anaitis plagiata (Linnaeus, 1758)
Phalaena plagiata Linnaeus, 1758

Additional Photo Sources

General References

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2021. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2023-11-30 3:09:49 AM]
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© E-Fauna BC 2021: An initiative of the Spatial Data Lab, Department of Geography, UBC