Morley's Final Catalogue: Both are sufficiently frequent at light everywhere: Ipswich, Monks Soham, Gorleston (referring also to Mottled rustic).

Recent Suffolk Status: Abundant.

Life history: Single-brooded. Occasional late records into October and November in recent times.

Identification: This species and the Rustic are probably one of the most difficult pair of UK species to separate. There are characters that can be used to identify them, but some can be difficult to see on worn moths. Firstly, the Uncertain is usually the first species to appear on the wing in Suffolk, followed a few weeks later by the Rustic. The Rustic is normally plainer and greyer, with less contrasting colours. Rustic also has a more glossy forewing but the Uncertain can become glossy with wear. Uncertain normally has more obvious cross lines. Any moths where it is not possible to separate to a species are either best not recorded or recorded as aggregate.

Habitat: A wide variety of habitats including gardens.

Recorded in 57 (98%) of 58 10k Squares.
First Recorded in 1940.
Last Recorded in 2023.