Argyresthia canadensis

Freeman, 1972

Sort #: 378 | P #: 360071 | MPG #: 2445
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Larval feeding type: The green or brownish-green larva mines the the leaves in the Fall and Spring leaving frass deposited throughout the mine. The larva can change leaves to mine. The larva pupates outside the mine, usually on the underside of a leaf in a white, mottled brown, silken cocoon (not just white, as in A. aureoargentella)
Larval substrate: Thuja occidentalis (Northern White Cedar)
Phenology: Adult: 6/06 to 7/09 (5 records)

Comment: The differences between A. freyella and A. canadensis adults are unclear. Freeman claimed that the median white basal streak of canadensis reaches 1/4 and in freyella it reaches 1/2, the costal basal streaks reach 1/4 and 1/3 respectively. However, there appears to be a lot of variation. Male genitalia are figure by Freeman and the two species have different host plants.

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

Distribution by County: Middlesex, Essex, Plymouth
Number of Records: 7