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Coleophora laricella (Hübner, 1817) - (larch casebearer)
This casebearer moth is native to Europe, where it can cause outbreaks on larch. It has been accidentally introduced into North America and was first recorded in Massachusetts in 1886. It has since spread to many northern parts of North America, also causing outbreaks in some areas. A number of natural enemies have been introduced into North America like the parasitoid Chrysocharis laricinellae (see Bartlett et al., 1978 p. 174).
The casebearer moth goes through a single generation per year. The young larvae hatching from the eggs bore into the needles and feed for several month. They emerge in late summer, construct a case and continue feeding. In autumn they move to twigs and branches and overwinter in their case. In spring they continue to feed and damage the young buds, before pupating in the case.
|• English:||larch casebearer|
|• Français:||porte-case du mélèze|
The adult moth is is around 5 mm long with a wingspan of about 8 mm. The forewings are narrow and fringed with a silvery brown colouration.