Grey dagger

Not to be confused with the gray dagger of North America (A. grisea).
Grey dagger
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Noctuidae
Genus: Acronicta
Species: A. psi
Binomial name
Acronicta psi
(Linnaeus, 1758)
Synonyms
  • Triaena psi

The grey dagger (Acronicta psi) is a moth of the family Noctuidae. It is found from Europe and North Africa to northern Iran, Central Asia, southern and central Siberia and Mongolia. In the Levant it is found in Lebanon and Israel.

Grey dagger larva feeding on a Japanese cherry tree in early autumn
Pupa

This species has grey forewings with bold black dagger-shaped markings. (The Latin specific name also refers to these markings, as resembling the Greek letter psi ψ.) The hindwings are dirty grey, generally paler in the male. The wingspan is 34–45 mm. This moth is very similar to the dark dagger (Acronicta tridens) and identification is generally only possible by minute examination of the genitalia. However, in general this moth is generally darker in colour than the dark dagger and always lacks the white hindwings often present in the male of that species.

The larvae of the two species are very different (see below). The grey dagger flies at night from June to August and is attracted to light and sometimes to sugar.

The larva is whitish below and black above with red spots and a bold yellow stripe along the back. It has a distinctive horn just behind the head (absent from the larva of dark dagger). It feeds on a wide range of plants, mainly trees and shrubs (see list below). The species overwinters as a pupa.

  1. ^ The flight season refers to the British Isles. This may vary in other parts of the range.

Recorded food plants

References

The grey dagger moth and caterpillar at UK Safari (includes pictures).

This article is issued from Wikipedia - version of the 5/19/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.