Glischrochilus quadrisignatus
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Four-Spotted Sap Beetle sighting in Calgary on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 136th most-seen of the 256 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Four-Spotted Sap Beetle in Calgary on a given day, so our monthly data shows no clear season.
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.
2nd of 13
Of the 13 cities where we can rate Four-Spotted Sap Beetle sightings, Calgary ranks 2nd at under 5%. The best odds are in Portland (United States, about 10%).
Same order: Coleoptera
The closest relatives of the Four-Spotted Sap Beetle that you can see in Calgary (order Coleoptera, Beetles) are Seven-Spotted Lady Beetle (about 30%), Two-Spotted Lady Beetle (about 20%) and Bronze Ground Beetle (about 10%), 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 Calgary (13 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.
