Hindwings as forewings, but lines much nearer together, irregularly curved, not forming costal spots.

[2][3][4] [5] The adult moths fly from May to July, depending on the location.

They have been found in haystacks or thatching, as well as in chicken (Gallus) and magpie (Pica) nests.

Its depredations can be prevented by keeping the hay dry and well ventilated, as the insect preferably breeds in moist or matted material such as is to be found in the lower parts of haystacks, where affected hay becomes filled with webbings of the caterpillars and their excrement, rendering it unfit for feeding.

A treatment is to burn the webbed material and to thoroughly clean the affected location.