About Acleris effractana (Hübner, 1799)
Acleris effractana, commonly known as the hook-winged tortrix moth, is a species of moth in the family Tortricidae. It was first described by Jacob Hübner in 1799. This moth has a Holarctic distribution. In Europe, it ranges from northern Europe down to the northern portion of central Europe. It can also be found in north-western Russia, Japan, Canada, and the northwestern United States. Acleris effractana is extremely similar to Acleris emargana, and was confused with this species until recently. The two species cannot be told apart by their external appearance; examination of their genitalia is required to distinguish them. Acleris effractana is a rather large, greyish moth. This species and Acleris emargana are easily identifiable by a distinct, round indentation in the costal section of the forewing. This indentation gives the appearance that a round section has been cut out of the wing. The outer edge of the wing also has a clear indentation, which gives the entire wing a sickle shape. Most of the biological information about this species remains poorly understood, because it is so hard to distinguish it from the likely more common Acleris emargana. Adult moths of this species fly between July and October. Larvae develop between spun leaves of various willow species (Salix spp.
