Noctuidae : Noctuinae
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Photo © Liz Goodyear,  Ware, Hertfordshire (17/09/23)

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Similar Herts & Middlesex Species: None
Dotted Rustic
Rhyacia simulans

(Hufnagel, 1766) 2105 / 73.339

General comments:
Formerly widespread but currently absent resident. Likely to reappear without warning.

There is a permanent resident population in Scotland and the north of England that is not, seemingly, interactive with southern populations. Southern English Dotted Rustics emerge in June, but after no more than two weeks enter a period of aestivation (summer equivalent of hibernation) and later awaken to fly in September and October. Localised declines may be due in part to a lack of aestivation sites, but the species is subject to colossal rises and falls in population size and geographical range. In our area it was abundant in the 1980s and then declined towards the end of the 1990s and since about 2000 there have been only one or two isolated records per year. Casual examination of the historical literature suggests that the periodicity of the rises and declines of this species is about 50 years - in which case the late 2020s might see a sudden increase in reports.

Retained Specimen / Photograph will be Required.

Recorded in 18 (44%) of 41 10k Squares.
First Recorded in 1960.
Last Recorded in 2023.
Additional Stats

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List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
01/10/2023120TL21 - Welwyn Garden City
26/09/2023120TL31 - Hertford
17/09/2023120TL31 - Hertford
04/09/2022120TL22 - Stevenage
16/06/2022120TL21 - Welwyn Garden City
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Dotted Rustic
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 17-21mm.
Flight: One generation June-July.
Foodplant:   Unknown
Red List: Least Concern (LC)
GB Status: Common
Former Status: Local
Verification Grade:  Adult: 3
 Immature Adult   [Show Flight Weeks]
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