Aedia leucomelas (Linnaeus, 1758)
Eastern Alchymist or Sweet Potato Leaf Worm
(one synonym : Catephia ramburii Boisduval, 1829)
ACRONICTINAE ,   NOCTUIDAE ,   NOCTUOIDEA
 
Don Herbison-Evans
( donherbisonevans@outlook.com)
and
Stella Crossley


The Caterpillar of this species is grey with darker grey mottling and with a broad pale yellow stripe running along each side, and orange lateral lines running above and below these broad stripes. There is sometimes a pale patch on the last abdominal segment, and two prominent black spots on the second abdominal segment. The Caterpillar feeds on a number of plants from the Bindweed family ( CONVOLVULACEAE ), including :

  • Australian Bindweed ( Convolvulus erubescens ),
  • Field Bindweed ( Convolvulus arvensis ),
  • Beach Morning Glory ( Ipomoea pes-caprae ),

    and is sometimes a pest on:

  • Sweet Potato ( Ipomoea batatas ).

    The caterpillar has also been found on:

  • Rush Skeleton Weed ( Chondrilla juncea, ASTERACEAE ).

    The Caterpillar grows to a length of about 5 cms. It pupates in a cell in the soil. Specimens pupating in late April in Melbourne emerged as adult moths about eight months later.


    (Photo: courtesy of Merlin Crossley)

    The adult moth is sooty black, with a light grey patch on the fore wings containing a pattern like an opening flower bud. The hind wings each have a white basal area and a white tornus and termen. The moth while at rest, displays these white patches by opening and closing its wings. The undersides of the wings have white basal areas, and the fore wings each have a crescent-shaped black discal dot.

    The pheromones of the species and the courtship behaviour have been studied. The species is attacked by a Nucleopolyhedrovirus.


    (Specimen: courtesy of the The Australian Museum)

    The species is found over much of the world, for example :

  • Bulgaria,
  • France,
  • Italy,
  • Japan, and
  • Sao Tome,
    The subspecies acronyctoides is found over the whole of Australia including
  • Queensland,
  • New South Wales,
  • Victoria,
  • Tasmania, and
  • South Australia.

    The placement of this genus, Aedia, into a subfamily is the subject of some controversy. Various authors place it in

  • AEDIINAE,
  • OPHIDERINAE,
  • CATOCALINAE, or
  • ACRONICTINAE.


    Further reading :

    David Carter,
    Butterflies and Moths, Collins Eyewitness Handbooks, Sydney 1992, p. 262.

    Ian F.B. Common,
    Moths of Australia, Melbourne University Press, 1990, fig. 45.14, p. 451.


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    (updated 15 May 2010, 17 September 2013)