Trioza centranthi
In 3 days ~20% in a week ~40%
Trioza centranthi is a sap-sucking hemipteran bug in the family Triozidae which creates galls on the leaves and flowers of Centranthus and Valerianella species. It was first described by Jean Nicolas Vallot, a French entomologist in 1829 and is found in Europe. 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 Valerian Psyllid sighting in London on a given day, based on 120 verified sightings from GBIF citizen-science data. It is the 277th most-seen of the 1504 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.
September to July
In those months about 10% of wildlife watchers report a Valerian Psyllid in London on a given day, against under 5% in August, the lowest month.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Valerian Psyllid sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 5 cities where we can rate Valerian Psyllid sightings, London has the highest daily chance: about 10%. Next come Liverpool (United Kingdom, about 10%) and Leeds (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Valerian Psyllid is recorded against all the insects logged in London (120 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.
