Last modified: April 13, 2021, 9:37 a.m.
A common species throughout Belgium.
The adults have been observed from early June till the end of August. The moths are active in the evening and later come to light.
The larva feeds inside the nuts of Fagus sylvatica. When the nuts fall, it vacates the nut and constructs a cocoon in which it hibernates. The larval stage may last for two years. Pupation takes place in a cocoon spun in the soil, in litter, in rotten wood or under bark or moss.