Urophora quadrifasciata
In 3 days ~10%
Urophora quadrifasciata is a species of tephritid or fruit flies in the genus Urophora of the family Tephritidae. The host plant for the larvae is usually a knapweed (Centaurea sp), and because of this, it is used to control Centaurea stoebe. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Berlin | 🇩🇪 Germany | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Toronto | 🇨🇦 Canada | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Four-Barred Knapweed Gall Fly sighting in New York City on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 1165th most-seen of the 1623 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Four-Barred Knapweed Gall Fly in New York City on a given day, so our monthly data shows no clear season.
Among the best
Of the 5 cities where we can rate Four-Barred Knapweed Gall Fly sightings, New York City ranks 5th at under 5%, level with the leaders once rounded. The best odds are in Berlin (Germany, under 5%), London (United Kingdom, under 5%) and Toronto (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Four-Barred Knapweed Gall Fly is recorded against all the insects logged in New York City (8 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.
