Common in coniferous woodland and plantations throughout much of the British Isles. In Hampshire and on the Isle of Wight fairly common in pine woodland in all three vice-counties, though apparently never the pest it sometimes is in other parts of the country. Wingspan 34-40 mm. Unmistakable. Larva feeds on Scots Pine, Corsican Pine, Norway Spruce and European Larch, causing sufficient damage to be a serious pest in some areas, over-wintering as a pupa.