Wingspan of 16-20 mm. Forewings reddish-brown with coppery sheen on outer two thirds of wing and grey on the inner third, usually with a dark band at the junction
between the two shadings. Hindwings are uniformly grey.
The larvae burrow into the stored product to feed within a silk woven feeding den, which expands as the larvae grows. Webbing, heaps of flour dust, frass and exuviae
are signs of infestation.