Last modified: Feb. 24, 2023, 4:48 p.m.
This is a rare species that was not recorded for more than 30 years, but is mentioned now for almost whole Belgium since 2004. It can sometimes be found in high numbers.
The moths, having a wingspan of 8–13 mm, display a metallic sheen and are hard to distinguish from the other species. Nevertheless, they often look a bit slimmer and have golden and purple-red scales. This species also has a striking silvery comma-shaped stain.
The caterpillar is white and has a pale brown head.
The large blotch mine is located close to the leaf margin and sometimes causes partially curling of the leaf. The black frass in the mine lies in so-called spaghetti strings.
See also bladmineerders.be
Pupation takes place inside a tough silken cocoon.
Most likely, the egg is laid in a leaf bud. The mine is a large blotch mine that is located close to the leaf margin sometimes partially curling the leaf. The black frass normally lies, as with all Eriocraniidae, in so-called spaghetti strings but this is less distinct with this species or even completely absent. In that case the frass is present as scattered grains.
The pupation takes place outside the mine.
The adult moths often fly in the sunshine around the host plants.
The moths are on the wing in April.
The larva mainly feeds on Carpinus betulus but also on Corylus avellana.