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June, 2018’s species of the month: Heart Moth (Dicycla oo)

Heart Moth by David Green

Heart Moth (Dicycla oo)
photo: David Green

Heart Moth by David Green

Heart Moth (Dicycla oo)
photo: David Green

Heart Moth habitat by Mark Parsons

Heart Moth habitat
photo: Mark Parsons

Heart Moth records

Total Heart Moth counted by day of month
(all records since 1990 to 2014)

We Heart Moths!

The Heart Moth has only been recorded in Sussex three times this century, but have we been looking for it?

Heart Moth is a UK Red Data Book species (RDB3) and also UK BAP (Section 41 in the Natural Environment and Rural Communities Act 2006). It is one of the 30 top priority moth species for conservation action in South East England based upon Butterfly Conservation’s Regional Action Plan 2016-2025, and it is top 10 priority in Sussex.

The required habitat is described the habitat as “lightly wooded commons and parkland with widely spaced Pedunculate Oaks, usually with other lower vegetation” (Waring and Townsend). Openly spaced trees on woodland rides or edges are also used. The only known UK strongholds are Windsor Great Park and Ashtead Common, near Epsom. However, we seem to have plenty of the required habitat in Sussex, especially in the Weald.

The Heart Moth recorded in Sussex in recent years (all as singles, and all in the north of the county) have all be at garden moth traps (Broadbridge, Sharpthorne and Crawley Down). The moth is known to be rather sedentary, not flying far from its habitat, so these garden sightings suggest there might be hitherto unidentified resident colonies nearby.

The core flight period is late June and early July. The moth is attracted to light and occasionally to sugar, although generally flies very late at night (after 1am).

Please let the SxBRC know if you would like to look for this moth and certainly let us know if you find it.


Previous species of the month:


Every month it is our aim to highlight a species that is “in-season” and, although not necessarily rare or difficult to identify, has been highlighted by our local recording groups as being somewhat under-recorded and for which new records would therefore be welcomed.

If you or your recording group are aware of species such as this then please contact Bob Foreman.