[2] In western Europe the moth flies from late May to July, and there is a partial second generation in August and September.

[3] The larvae initially feed in September tying two sets of needles and attach it to the branch of the host plant.

The following year, the larva eat new shoots and may bore into the stem, which can cause them to shrivel and break off.

On juniper the larva spins a thick white web amongst the leaves.

[4][5] Larva can be found on silver fir (Abies alba), European larch (Larix decidua), common juniper (Juniperus communis), spruce (Picea species), Scots pine (Pinus sylvestris) and cedars (Thuja species).