Scientific name: Hydraecia osseola
Flies at night in late August to early October and comes to light. Occasionally wanders from breeding sites.
- Medium Sized
- Wing Span Range (male to female) - 40-50mm
- UK BAP: Priority Species
- Red Data Book
Overwinters as an egg. The larva feeds in the stem and roots from May to July, pupating underground.
Particular Caterpillar Food Plants
Marsh-mallow (Althaea officinalis)
- Countries – England
- Romney Marsh in Kent and on the East Sussex border, also the Medway Valley, Kent. Historically also recorded near Hailsham, East Sussex.
- Distribution Trend Since 1970’s = Britain: Stable
Grazing levels and along the banks of brackish rivers.