Eulecanium cerasorum
In 3 days ~10% in a week ~20%
Eulecanium cerasorum, the calico scale, is a species of scale insect. It can be identified by its white and brown color on its outer circular shell which will continuously darken over age. It is approximately one quarter of an inch in diameter. The Calico Scale is a pest to many trees in the United States, including dogwoods, honey locust, magnolias, maples, sweetgums and fruit trees. This pest typically attacks the branches which stresses the trees. Mature females produce honeydew, which promotes the growth of mold around the tree.
The nymph migrates along a tree branch, then settles down and creates a circular hardened shell or cap to be its protective coat against predators and pesticides. The typical female is known to lay around 4500 eggs inside its cap. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Philadelphia | 🇺🇸 United States | |
| 2 | New York City | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Calico Scale sighting in Philadelphia on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 432nd most-seen of the 632 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.
April and May
In those months about 10% of wildlife watchers report a Calico Scale in Philadelphia on a given day, against under 5% in June to March, the lowest months.
Yes
Of the 3 cities where we can rate Calico Scale sightings, Philadelphia has the highest daily chance: under 5%. Next come New York City (United States, under 5%) and Washington (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Calico Scale is recorded against all the insects logged in Philadelphia (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.
