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 Bavarian Forest National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 727th most-seen of the 1115 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 July–August
In those months about 10% of wildlife watchers report a Four-Spotted Sap Beetle in Bavarian Forest National Park on a given day, against under 5% in June and September–April, 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.
Only Bavarian Forest National Park, in our data
Bavarian Forest National Park is the only park on Wallace's Line with enough records to rate Four-Spotted Sap Beetle sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Four-Spotted Sap Beetle is recorded against all the insects logged in Bavarian Forest National Park (7 verified sightings from 2019 to 2026), 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.
