Curculio occidentis
In 3 days ~10%
Curculio occidentis, the filbert weevil, is a species of weevil in the genus Curculio. The weevils are considered a pest for many species of oak tree due to the damage they cause to acorns. Curculio occidentis is native to the western side of North America. Its range includes British Columbia in Canada, California, Arizona, New Mexico and Utah in the United States, and Mexico.
The female Curculio occidentis lays small batches of two to four eggs in a developing acorn. The resulting larvae feed on the kernel and when fully developed, tunnel out of the nut, fall to the ground and dig themselves a small soil chamber. They may wait one or two years before pupating. In infestation damage research, Quercus garryana acorns were collected in 1996, 1997 (low crop years) and in 1998 (high crop year). Researchers concluded that levels of infestation did not vary with crown level during the low crop years but varied during the high crop year.
During the high crop year, weeviled acorns were more present at the lower portion of the tree than the upper part of the tree. Together with larva of the filbertworm moth (Cydia latiferreana), the filbert weevil feeds on... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States | |
| 2 | Los Angeles | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a California Acorn Weevil sighting in San Francisco on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 679th most-seen of the 737 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a California Acorn Weevil in San Francisco on a given day, so our monthly data shows no clear season.
Yes
Of the 2 cities where we can rate California Acorn Weevil sightings, San Francisco has the highest daily chance: under 5%. Next come Los Angeles (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the California Acorn Weevil is recorded against all the insects logged in San Francisco (5 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.
