|scientific name Argyresthia columbia |
Primarily boreal habitats, where the western larch (Larix occidentalis) grows.
Adults appear in June.
"Antenna with brown and white alternating annulations. Head ochreous. Thorax and forewing straw yellow. Fringe whitish. Hind wing pale grey; fringe whitish. Legs straw yellow. Wingspread 12-14 mm." (Freeman, 1972: 696). Male genitalia discussed and illustrated in Freeman (1972: 696; fig. 25).
There are no confirmed records yet of this species for Alberta. It closely resembles A. laricella which is larger, has longer hair pencils in the male genitalia, and has a different food plant (1972: 696). It might also be mistaken for other species of Argyresthia with uniform ground color on the forewing (A. abies, A. flexilis, A. mariana) but is different from all of them in its food plant (Larix occidentalis).
The larva bores into terminal twigs of Larix occidentalis (Freeman, 1972: 696).
Not of concern.
All the type material was reared from larvae on western larch, Larix occidentalis (Freeman, 1972: 696).
So far only recorded from southeast British Columbia; listed as probable species for Alberta (Pohl et al., in prep.).
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