September Thorn
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Ennomos erosaria
Reasonably common in England & Wales, becoming scarcer in the north of England & Scotland, also rare in Ireland.
The Larva which is rather elongate, with strong knob-shaped protuberances, altogether bearing a remarkable likeness to an oak twig is brown, now with a tinge of purple, now of greenish, the ventral surface paler greenish brown.
The Larvae feeds on Oak, Birch & Lime.
The ground colour is straw yellow to ochre-yellow.
The colour is darker on hindwing termen and the hindwing also has a faint discal spot.
The fasciae (bands) are brown.
Similar species: other Ennomos species.
The Moths fly in one generation from July to October.
They are attracted to light.