Author: (Ratzeburg, 1840)
Larch bark moth
Species Overview:
Adult: 14-18 mm wingspan; forewing olive-grey with bluish hue; interspaces between costal strigulae white; median field with 4-5 blackish spots, arranged in a near diamond pattern; ocellar area with some smaller blackish dashes. Hindwing dark fuscous.
Egg: deposited singly on the phloem of old branches or trunks of 4-10 year old larches, exposed by deer's antlers or other mechanical injury.
Larva: light grey.
Pupa: dark-brown, matt; hidden under the bark.
Taxonomic Description:
Male:
Cydia zebeana adult
C. zebeana forewing markings
External characters: 14-18 mm wingspan. Forewing olive-grey with bluish hue. Costal strigulae blackish, variable in size, interspaces between them white. Median field with 4-5 blackish spots, arranged in a near diamond pattern. Ocellar area with some smaller blackish spots, posterior to these a grey stria parallel to termen. Hindwing dark fuscous.
male genitalia Cydia zebeana
Genitalia: Ventral margin of neck of valva without protuberance. Aedeagus open in distal lower side, upper wall sclerotized, apex not pointed. Cornuti not arranged in one row.
Female:
External characters: Similar to male.
female gen. Cydia zebeana
Genitalia: Sterigma less broad than in Cydia milleniana. Anterior margin of lamella postvaginalis with small median processes, lamella postvaginalis slightly elongated laterally. Posterior margin rounded. Ductus bursae and posterior part of ductus seminalis sclerotized. Corpus bursae with two small signa.
Biology:
Moths fly in May and June. Eggs are deposited singly on the phloem of old branches or trunks of 4-10 year old larches, exposed by deer's antlers or other mechanical injury. The larva mines under the bark, showing no obvious indication of its presence (resinous galls are not formed). The larva takes two years to develop. Pupation occurs in the tunnels under the bark (Whitebread, 1975).
Host plants:
Larix spp.
Damage:
Larvae tunnel under the bark of Larix species. It appears to be less common than Cydia milleniana, a species that has often been confused with Cydia zebeana.
Distribution:
Central and Eastern Europe; Siberia, China.
Also known from the Netherlands.
Pheromone:
Pheromone unknown.
Attractantia:
E 8-12Ac : 1
E 10-12Ac : 1
(Booij and Voerman, 1984a)
or
E 8-12Ac : 9
E 10-12Ac : 1
(Booij et al., 1986)
Parasitoids:
(Record from China)
Campoplex sp. (Ichneumonidae)
Macrocentrus sp. (Braconidae)