Bactrocera tau
In 3 days ~20% in a week ~30%
Zeugodacus tau (syn. Bactrocera tau), the pumpkin fruit fly or the tau fruit fly, is a species of fruit fly in the family Tephritidae. The species is native to tropical and subtropical Asia. It is a major pest species of melons and other cucurbits.
In 2023 the tau fruit fly was found in California. In response, the California Department of Food and Agriculture imposed a quarantine on a portion of Los Angeles County. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Tau Fly sighting in Nanjing on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 242nd most-seen of the 272 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.
September and November–December
In those months about 10% of wildlife watchers report a Tau Fly in Nanjing on a given day, against under 5% in January–August and October, the lowest months.
Yes
Of the 2 cities where we can rate Tau Fly sightings, Nanjing has the highest daily chance: about 10%. Next come Shanghai (China, about 10%).
Same order: Diptera
The closest relatives of the Tau Fly that you can see in Nanjing (order Diptera, Flies) are Ptecticus aurifer (about 10%), Marmalade Hover Fly (about 10%) and Black Soldier Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Tau Fly is recorded against all the insects logged in Nanjing (5 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.
