Eriosoma ulmi
In 3 days ~20% in a week ~50%
Eriosoma ulmi, the elm-currant aphid, is a species of aphid in the family Aphididae found in Asia and Europe. It is a true bug and sucks sap from plants. It was described by Carl Linnaeus in his Systema Naturae, published in 1758. The mite causes abnormal plant growths, known as galls on their primary host, elm trees (Ulmus species). To complete there life-cycle they feed on a secondary host, the roots of currant bushes (Ribes species). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra Nevada National Park | 🇪🇸 Spain |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report an Elm-Currant Aphid sighting in Sierra Nevada National Park on a given day, based on 21 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 330th most-seen of the 479 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report an Elm-Currant Aphid in Sierra Nevada National Park on a given day, against under 5% in August and October–March, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Elm-Currant Aphid sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Sierra Nevada National Park, in our data
Sierra Nevada National Park is the only park on Wallace's Line with enough records to rate Elm-Currant Aphid sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Aphididae
The closest relatives of the Elm-Currant Aphid that you can see in Sierra Nevada National Park (family Aphididae, Aphids) are Pistacia Horn Gall Aphid (about 10%), Pemphigus populi (about 10%) and Pistachio-Grass Root Aphid (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Elm-Currant Aphid is recorded against all the insects logged in Sierra Nevada National Park (21 verified sightings from 2019 to 2026), 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.
