Acronicta rumicis
In 3 days ~40% in a week ~70%
Acronicta rumicis, the knot grass moth, is a species of moth which is part of the genus Acronicta and family Noctuidae. It was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. It is found in the Palearctic region. A. rumicis lives and feeds on plants located in wide-open areas. At its larval stage, as a caterpillar, it causes such a large impact as a crop pest that it has received much attention and research. A. rumicis feeds on maize, strawberries and other herbaceous plants.
The moth's evolution has been affected by the industrial melanism that occurred in Europe during the late 19th and early 20th centuries, causing a dramatic increase in two aberrations (salicin and lugubris), which have darker grey wings. Today, A. rumicis is important to conservation efforts in the United Kingdom, because, like many other species, it is in decline. However, as it is part of a UK Priority Biodiversity Action Plan and receiving greater awareness and conservation, the species may become more abundant.
A. rumicis has a wingspan of 34–44 mm. The forewings are blotched with a mixture of dark and light-grey shades, while the hindwings... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gauja National Park | 🇱🇻 Latvia | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 3 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 4 | Wadden Sea National Park | 🇩🇪 Germany | |
| 5 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 6 | Cévennes National Park | 🇫🇷 France | |
| 7 | Pyrénées National Park | 🇫🇷 France | |
| 8 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 9 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
Possible
About 20% of wildlife watchers report a Knot Grass Moth sighting in Bavarian Forest National Park on a given day, based on 58 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 54th most-seen of the 1115 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
September and October
In those months about 30% of wildlife watchers report a Knot Grass Moth in Bavarian Forest National Park on a given day, against under 5% in November to March, the lowest months.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Knot Grass Moth sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 9 parks where we can rate Knot Grass Moth sightings, Bavarian Forest National Park ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Gauja National Park (Latvia, about 20%).
Same genus: Acronicta
The closest relatives of the Knot Grass Moth that you can see in Bavarian Forest National Park (genus Acronicta, Dagger Moths) are Sycamore Moth (about 10%), Poplar Grey (about 10%) and Grey Dagger (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Knot Grass Moth is recorded against all the insects logged in Bavarian Forest National Park (58 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.
