Psyllopsis fraxini
In 3 days ~20% in a week ~40%
Psyllopsis fraxini is a psyllid which lives within a gall on ash (Fraxinus excelsior). Eggs are laid in the autumn on dormant buds and the nymphs hatch in the spring and feed on the leaves. The host plant reacts by producing extra cells and the affected areas become swollen and rolls downwards and encloses the wax covered nymphs. Each gall may contain two or three generations and by the end of summer contain all stages of the insect. The galls are pale-coloured with violet or red markings. 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 an Ash Psyllid sighting in Liverpool on a given day, based on 19 verified sightings from GBIF citizen-science data. It is the 289th most-seen of the 632 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.
August and October
In those months about 20% of wildlife watchers report an Ash Psyllid in Liverpool on a given day, against under 5% in November to May, the lowest months.
Yes
Of the 3 cities where we can rate Ash Psyllid sightings, Liverpool has the highest daily chance: about 10%. Next come London (United Kingdom, under 5%) and Auckland (New Zealand, under 5%).
Same order: Hemiptera
The closest relatives of the Ash Psyllid that you can see in Liverpool (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Green Shield Bug (about 40%), Dock Bug (about 30%) and Forest Bug (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Ash Psyllid is recorded against all the insects logged in Liverpool (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.
