Urophora stylata
In 3 days ~10% in a week ~30%
Urophora stylata 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 thistle of genus Cirsium or Carduus. It has been introduced in North America as a biocontrol of C. vulgare, which has become an invasive species.
Throughout Europe East to Japan; introduced to India, Pakistan, Australia, North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Bull Thistle Gall Fly sighting in Auckland on a given day, based on 19 verified sightings from GBIF citizen-science data. It is the 291st most-seen of the 689 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
December to March
In those months about 10% of wildlife watchers report a Bull Thistle Gall Fly in Auckland on a given day, against under 5% in April to November, the lowest months.
Yes
Of the 4 cities where we can rate Bull Thistle Gall Fly sightings, Auckland has the highest daily chance: about 10%. Next come London (United Kingdom, under 5%) and Melbourne (Australia, under 5%).
GBIF citizen-science records
It is estimated from how often the Bull Thistle Gall Fly is recorded against all the insects logged in Auckland (19 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.
