Trioza adventicia
In 3 days ~20% in a week ~40%
Trioza adventicia, commonly known as the syzygium leaf psyllid, lillypilly psyllid, or eugenia psyllid, is a sap-sucking hemipteran bug in the family Triozidae which creates galls on the leaves of Syzygium paniculatum. This species is native to eastern Australia and has been introduced into California, southern Australia, and New Zealand.
The nymphs form pit galls in the leaves and stunt the plant's growth. Trioza adventicia was for decades identified as Trioza eugeniae Froggatt 1901 in the ornamental plant industry, in the field of biological pest control in the United States, and in its native eastern Australia, resulting in a large body of academic literature—and an even larger number of horticultural resources—using the latter name for the present species. Using multiple lines of morphological evidence and DNA barcoding, a 2019 study confirmed that T. adventicia and T. eugeniae are distinct species, and determined that the widespread introduced species on Syzygium paniculatum that had long been known as T. eugeniae is in fact T. adventicia. The true T. eugeniae is only known to occur in a small region of southeastern Australia. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Auckland | 🇳🇿 New Zealand | |
| 2 | Sydney | 🇦🇺 Australia | |
| 3 | San Francisco | 🇺🇸 United States | |
| 4 | San Diego | 🇺🇸 United States | |
| 5 | Brisbane | 🇦🇺 Australia | |
| 6 | Los Angeles | 🇺🇸 United States | |
| 7 | Melbourne | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Syzygium Leaf Psyllid sighting in Auckland on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 233rd most-seen of the 689 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
February, April and July–December
In those months about 10% of wildlife watchers report a Syzygium Leaf Psyllid in Auckland on a given day, against under 5% in January, March and May–June, the lowest months.
Yes
Of the 7 cities where we can rate Syzygium Leaf Psyllid sightings, Auckland has the highest daily chance: about 10%. Next come Sydney (Australia, under 5%) and San Francisco (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Syzygium Leaf Psyllid is recorded against all the insects logged in Auckland (26 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.
