Glischrochilus quadrisignatus
In 3 days ~10% in a week ~30%
Glischrochilus quadrisignatus, known generally as four-spotted sap beetle, is a species of sap-feeding beetle in the family Nitidulidae. Other common names include the beer bug and picnic beetle. It is found in North America.
Four-spotted sap beetles (and other sap beetles) feed on fruits and vegetables that are either damaged, overripe, or decomposing. At times they can also feed on intact fruits and vegetables after first being attracted to and feeding on the damaged or decomposing fruits and vegetables. They often leave deep holes in fruits and vegetables. These look similar to holes made by slugs.
The University of Minnesota Extension program recommends sanitation as the best method for managing sap beetles in a garden. They also say that pesticides are not very effective and they recommend against using them to manage sap beetles. Bait traps may be set out as an alternative management option using overripe fruit or other baits. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Calgary | 🇨🇦 Canada | |
| 3 | Vancouver | 🇨🇦 Canada | |
| 4 | Montreal | 🇨🇦 Canada | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 7 | Prague | 🇨🇿 Czechia | |
| 8 | Denver | 🇺🇸 United States | |
| 9 | Boston | 🇺🇸 United States | |
| 10 | Vienna | 🇦🇹 Austria |
With luck
About 10% of wildlife watchers report a Four-Spotted Sap Beetle sighting in Portland on a given day, based on 40 verified sightings from GBIF citizen-science data. It is the 147th most-seen of the 507 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.
March–May, July and October
In those months about 10% of wildlife watchers report a Four-Spotted Sap Beetle in Portland on a given day, against under 5% in June, August–September and November–February, the lowest months.
Between 6 and 9 pm
Across all the parks we cover, that three-hour window holds the most Four-Spotted Sap Beetle sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 13 cities where we can rate Four-Spotted Sap Beetle sightings, Portland has the highest daily chance: about 10%. Next come Calgary (Canada, under 5%) and Vancouver (Canada, under 5%).
Same order: Coleoptera
The closest relatives of the Four-Spotted Sap Beetle that you can see in Portland (order Coleoptera, Beetles) are Asian Lady Beetle (about 30%), Seven-Spotted Lady Beetle (about 20%) and Western Polished Lady Beetle (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Four-Spotted Sap Beetle is recorded against all the insects logged in Portland (40 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.
