Lochmaea crataegi
In 3 days ~20% in a week ~30%
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 Birmingham on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 367th most-seen of the 811 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
April and May
In those months about 10% of wildlife watchers report a Hawthorn Leaf Beetle in Birmingham on a given day, against under 5% in June to March, the lowest months.
Among the best
Of the 3 cities where we can rate Hawthorn Leaf Beetle sightings, Birmingham ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in London (United Kingdom, about 10%).
GBIF citizen-science records
It is estimated from how often the Hawthorn Leaf Beetle is recorded against all the insects logged in Birmingham (17 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.
