Pemphigus populitransversus
In 3 days ~10% in a week ~20%
Pemphigus populitransversus also known as poplar petiole gall aphid or cabbage root aphid, induces galls on the leaves of poplar trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States | |
| 3 | New York City | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Poplar Petiole Gall Aphid sighting in Chicago on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 669th most-seen of the 978 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Poplar Petiole Gall Aphid in Chicago on a given day, so our monthly data shows no clear season.
Among the best
Of the 4 cities where we can rate Poplar Petiole Gall Aphid sightings, Chicago ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Boston (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Poplar Petiole Gall Aphid is recorded against all the insects logged in Chicago (9 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.
