Lochmaea crataegi
In 3 days ~20% in a week ~50%
Lochmaea crataegi is a species of leaf beetle native to Europe. Locally distributed throughout England and Wales, less extensively so in southern Scotland. Adults are found on hawthorn (Crataegus) blossom, around Watford it seems exclusively so as beating the earlier flowering blackthorn (Prunus spinosa), among many other types of blossom, over the years has failed to produce the species. Depending on season Crataegus begins to flower during the third week of April when occasionally single Lochmaea are found, numbers increase until the first or second week of may when Crataegus blossom is everywhere and the adults can be beaten in numbers throughout our area. They are active throughout May and are often found alongside Neocoenorrhinus aequatus. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom | |
| 2 | Birmingham | 🇬🇧 United Kingdom | |
| 3 | Vienna | 🇦🇹 Austria |
With luck
About 10% of wildlife watchers report a Hawthorn Leaf Beetle sighting in London on a given day, based on 194 verified sightings from GBIF citizen-science data. It is the 244th most-seen of the 1504 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
March and April
In those months about 20% of wildlife watchers report a Hawthorn Leaf Beetle in London on a given day, against under 5% in June, August–October and December–January, the lowest months.
Yes
Of the 3 cities where we can rate Hawthorn Leaf Beetle sightings, London has the highest daily chance: about 10%. Next come Birmingham (United Kingdom, about 10%) and Vienna (Austria, under 5%).
Same family: Chrysomelidae
The closest relatives of the Hawthorn Leaf Beetle that you can see in London (family Chrysomelidae, Leaf Beetles) are Rosemary Beetle (about 20%), Alder Leaf Beetle (about 10%) and Lily Leaf Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Hawthorn Leaf Beetle is recorded against all the insects logged in London (194 verified sightings), 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.
