Last modified: June 24, 2021, 7:21 p.m.
A fairly common species throughout Belgium.
See also bladmineerders.be
The adult flies from late April till mid June, but a partial second generation is observed in warm years in August. During the day they are easily disturbed from rest amongst the branches of spruce. They fly on sunny afternoons but are more active towards sunset and later come to light.
The larva feeds mainly on Picea abies and occasionally on other Picea species. It spins some leaves together, especially on young shoots. It hibernates in the spinning which it vacates when fully fed in spring. It drops to the ground and spun a silken cocoon between leaf-litter on the ground. It pupates in that cocoon around April.