Cyrtepistomus castaneus
In 3 days ~20% in a week ~40%
Cyrtepistomus castaneus, the Asiatic oak weevil, is a species of Asian broad-nosed weevil in the beetle family Curculionidae. It is native to Asia, and was first found in North America in 1933. Larvae feed on root hairs in soil, whereas adult beetles are defoliators of Quercus and Acer rubrum trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Washington | 🇺🇸 United States | |
| 3 | New York City | 🇺🇸 United States | |
| 4 | Baltimore | 🇺🇸 United States | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | Philadelphia | 🇺🇸 United States | |
| 7 | Chicago | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report an Asian Oak Weevil sighting in Boston on a given day, based on 81 verified sightings from GBIF citizen-science data. It is the 190th most-seen of the 1200 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.
May and July–October
In those months about 10% of wildlife watchers report an Asian Oak Weevil in Boston on a given day, against under 5% in June and November–April, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Asian Oak Weevil sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 7 cities where we can rate Asian Oak Weevil sightings, Boston has the highest daily chance: about 10%. Next come Washington (United States, under 5%) and New York City (United States, under 5%).
Same family: Curculionidae
The closest relatives of the Asian Oak Weevil that you can see in Boston (family Curculionidae, True Weevils) are Peach Root Weevil (about 10%), Green Immigrant Leaf Weevil (about 10%) and Two-Banded Japanese Weevil (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Asian Oak Weevil is recorded against all the insects logged in Boston (81 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.
