Author: (Clerck, 1759)
Species Overview:
Adult: 18-23 mm wingspan; forewing ground colour white, visible as a conspicuous triangular patch at costa. Remainder of wing brownish, with blackish and bluish grey strigulation and dark brown sub-basal and median fasciae. Hindwing brownish grey.
Larva: abdomen pale grey; head, prothoracic plate and pinacula black; anal plate brown.
Pupa: ca. 11 mm long, black. Body with well-developed cremaster, caudal end of cremaster truncate. Second abdominal segment with one row of spines [details pupa Hedya dimidiana ].
Taxonomic Description:
Male:
Hedya dimidiana adult 1
Hedya dimidiana adult 2
External characters: 18-23 mm wingspan. Forewing ground colour white, visible as a conspicuous triangular patch at costa. Remainder of wing brownish, with blackish and bluish grey strigulation and dark brown sub-basal and median fasciae; cilia brown-grey, with blackish sub-basal line. Hindwing brownish grey; cilia paler with dark sub-basal line (Kennel, 1908-1921).
male genitalia H. dimidiana
Genitalia: Valva elongated, with tufts of setae along ventral margin of sacculus. Aedeagus without cornuti. Uncus tapering apically. Socii relatively small. Gnathos spined.
Female:
External characters: similar to male.
female genitalia H. dimidiana
Genitalia: Sterigma strongly broadening medially, rounded anteriorly; caudal margin deeply concave. Antrum elongated, weakly sclerotized. Corpus bursae with two signa, one smaller than the other.
Biology:
Moths fly from mid May till the end of June; larvae occur in April and May, feeding in open buds and rolled leaves (Kuznetsov, 1987).
Host plants:
Prunus padus, Prunus virginiana, Malus.
Damage:
Larvae of this species can be found on apple, feeding in open buds or in rolled leaves. It does not appear to be economically important.
Distribution:
Central belt of Western Europe to Eastern Russia, China, Korea and Japan.
Pheromone:
Pheromone unknown.
Attractantia:
E 8E 10-12Ac
(Ando et al., 1987)
or
E 8E 10-12Ac : 10
E 8-12Ac : 1
(Arn, 1995-99)