Coleophora laricella (Coleophoridae)

larch casebearer


Coleophora laricella, the larch casebearer, adult. Adults are tiny (4 mm) silvery-brown moths with narrow fringed wings.


Coleophora laricella larvae. 5-6 mm long brown larvae. Found within a piece of hollow needle.


Needles damaged by mining of larval Coleophora laricella. Eggs are laid singly on needles from late May until early July. Newly hatched larvae mine into needles, hollow out a portion, line it with silk and then sever it from the rest of the needle. Larvae move about, feed and then pupate in their needle case.

Principal Hosts:

Western larch.

Economic Importance:

Trees are not killed by this pest but heavy defoliation can significantly reduce annual wood production.

References and Links:

EAG: 479-480; FC: 174.

See HForest and JP17.

Additional Images:

see white case of larvae larvae on needles