Tortricidae

49.133 Birch Straw Thyraylia nana (Haworth, 1811)

Common

Similar species:

Forewing: 4 to 6mm

Habitats: Mature birch woodland, heathland and moorland birch stands.

Habits: The larva is easily disturbed from mature birch trunks and foliage during the day and flies around the trees at dusk. It comes to light.

Foodplant: The larva feeds in a birch catkin. The full-fed larva overwinters from October in a silk cocoon in a bark crevice, where it pupates in early May.