Argyresthia thuiella

(Packard, 1871)
Arborvitae Leafminer

Sort #: 384 | P #: 360109 | MPG #: 2481
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Larval feeding type: The larva mines the the leaves in the Fall and feeds again in the Spring. In the Spring the frass is ejected from the mine and the larva pupates in this portion of the mine. The larva and pupa are green.
Larval substrate: Thuja occidentalis* (Northern White Cedar)
Phenology: Adult: 5/24 to 6/30 (19 records)

Comment: Similar feeding pattern to Coleotechnites thujaella, but the larva is green, not red.

Status in MA (automated assessment): Fairly widespread, uncommon
Status in N. America: Native
MA Endangered Species Act status: None
First Year Reported: 1932
Last Year Reported: 2024

Distribution by County: Berkshire, Franklin, Middlesex, Norfolk, Bristol, Plymouth
Number of Records: 21