The reed tussock (Laelia coenosa) is a species of moth of the Lymantriidae family. It is found in North Africa, southern and central Europe, through Russia and eastern Asia up to Japan. The wingspan is 35–50 mm. The moth flies from July to August depending on the location. The larvae primarily feed on Phragmites australis and Phragmites communis, but also Festuca, Carex and Cladium species.