Otiorhynchus meridionalis
In 3 days ~10% in a week ~30%
Otiorhynchus meridionalis, the lilac root weevil, is a species of broad-nosed weevil in the family Curculionidae. It is found in North America. Lilac root weevils are shiny, brownish-black beetles, about 0.25 inches (6 mm) with long snout (rostrum) and geniculate (elbowed) antennae. They are common landscape pests, feeding on lilac, euonymous and peonies.
Larvae feed on plant roots, while adult insects feed on leaves, eating only the edges in form of numerous U-shaped notches. They are commonly present on North American lilac, but rarely create lasting damage to the plant.
Adult insects are nocturnal. Like other root weevils (O. ovatus, O. rugostriatus and O. sulcatus), they often wander into households during hot summer months in search for shade and moisture. Although harmless to humans, pets and furnishings, they pose a nuisance. Treatment with pyrethroid-based insecticides is recommended only in cases of severe infestations, and the occasional bug is best tolerated or removed mechanically. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Salt Lake City | 🇺🇸 United States | |
| 2 | Denver | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Lilac Root Weevil sighting in Denver on a given day, based on 25 verified sightings from GBIF citizen-science data. It is the 175th most-seen of the 461 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
May and August
In those months about 10% of wildlife watchers report a Lilac Root Weevil in Denver on a given day, against under 5% in June–July and September–April, the lowest months. Those are among Denver's wettest months, with about 55 mm of rain a month against 15 mm in January.
2nd of 2
Of the 2 cities where we can rate Lilac Root Weevil sightings, Denver ranks 2nd at under 5%. The best odds are in Salt Lake City (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Lilac Root Weevil is recorded against all the insects logged in Denver (25 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.
