Cosmia trapezina

Dun-bar

Description

Wingspan is 30–35 mm, ground colour yellow-brown to reddish-brown with conspicuous two lines which divide forewings to thirds, when medium third is darker. Larva is up to 35 mm long, mature yellow-green to grass-green. Dorsal line is wider than subdorsal one, yellow-white in colour. Lateral line is very wide, greenish-yellow, yellowish on margins lies above the spiracles and goes to anal legs. Dark and inconspicuous narrow line is above that lateral line. Spiracles are greyish, with brown circle and white centre. Pinnacles are small, but conspicuous, dark. Setae are small, dark and conspicuous. Head green with dark-brown mouthpart and black eyes. Larva feeds polyphagously on broadleaved trees, such as Quercus spp., Ulmus spp. etc., facultative entomophagous. The dun-bar prefers deciduous forests, orchards, gardens. Abundant and widespread in oak stands, in warmer regions often not rare.

Symptom

A green caterpillar with a series of tiny black dots and a characteristic white stripe on the sides that distinguishes it from several similar species.

Tree Species: Elm, Birch, Beech, Dogwoods, Oak, Hornbeam, Ash, Maple, Hazel, Willow

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes