Oncocera semirubella
In 3 days ~30% in a week ~60%
Oncocera semirubella, the rosy-striped knot-horn, is a small moth of the family Pyralidae. It is found in European regions, including the British Isles, and East Asia (e.g. China, Japan, South Korea and Taiwan). The wingspan is 26–30 mm. The forewings are light crimson or pink, sometimes much mixed with grey or dark grey, a whitish, greyish-ochreous, or grey costal streak; a broad ochreous-yellowish dorsal suffusion. Hindwings grey, slightly rosy-tinged.
The larva is bronzy-blackish, with ten indistinct greenish lines; a whitish lateral spot on 3, including a black dot; head and plate of 2 black : amongst web on Lotus. The adult moth flies in one generation by the end of June to August.[1] It is easily disturbed on short grassland, flies from dusk onwards, and is attracted to light and sugar.
The larvae feed on bird's-foot trefoil (Lotus corniculatus), white clover, Ononis species, horseshoe vetch and Medicago species. ^The flight season refers to Belgium and the Netherlands; this may vary in other parts of its range.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany | |
| 3 | Cévennes National Park | 🇫🇷 France | |
| 4 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a Rosy-Striped Knot-Horn sighting in Bavarian Forest National Park on a given day, based on 39 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 108th most-seen of the 1115 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
June and August–September
In those months about 20% of wildlife watchers report a Rosy-Striped Knot-Horn in Bavarian Forest National Park on a given day, against under 5% in October to May, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Rosy-Striped Knot-Horn sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 4 parks where we can rate Rosy-Striped Knot-Horn sightings, Bavarian Forest National Park has the highest daily chance: about 10%. Next come Wadden Sea National Park (Germany, about 10%) and Cévennes National Park (France, about 10%).
GBIF citizen-science records
It is estimated from how often the Rosy-Striped Knot-Horn is recorded against all the insects logged in Bavarian Forest National Park (39 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
