Udea ferrugalis, the rusty dot pearl, is a moth of the family Crambidae.

[1] This species can be found in central and southern Europe, Asia Minor, Africa, India and Japan.

The forewings of these small moths have yellow, brown or ferruginous ground colour and prominent indistinct dark brown or blackish markings towards the edge.

The larvae feed on various herbaceous plants, such as Stachys, Arctium, Lycopus, Mentha, Eupatorium cannabinum and Fragaria vesca.

[6] This species is sometimes considered a pest, as the larvae attack various crop plants.