Last modified: May 12, 2022, 11:01 a.m.
First observation of this very rare species in Belgium was in AN (2003). Afterwards rarely seen. Can be confused with Cydia pactolana, therefore study of the genitals is recommended, although habitat (and food plant) are a guide to species recognition.
Wingspan 12,5–16 mm. In external characteristics, this species differs in its more black-gray color and more compact shape than Cydia pactolana. On the underside of the rear wing, a lighter spot is present in Cydia pactolana, which is missing in C. grunertiana.
The female lays the eggs on the trunks of 15–30 year old Larix sp. The caterpillar lives under the bark and hibernates at a young stage. Pupation takes place in May in the larval habitation.
The adults have been observed from mid-May till July. The late date of the first Belgian specimen is possibly due to an extremely warm summer.
The larva lives under the bark of Larix.