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 Shanghai on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 127th most-seen of the 215 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.
November
In that month about 20% of wildlife watchers report a Tau Fly in Shanghai on a given day, against under 5% in January–April, June–July and October, the lowest months.
Among the best
Of the 2 cities where we can rate Tau Fly sightings, Shanghai ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Nanjing (China, about 10%).
Same order: Diptera
The closest relatives of the Tau Fly that you can see in Shanghai (order Diptera, Flies) are Marmalade Hover Fly (about 10%), Phytomia zonata (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 Shanghai (11 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.
