About Glischrochilus quadrisignatus (Say, 1835)
Glischrochilus quadrisignatus, most commonly known as the four-spotted sap beetle, is a species of sap-feeding beetle belonging to the family Nitidulidae. It is also known by two other common names: beer bug and picnic beetle. This species is found in North America. Four-spotted sap beetles, like other sap beetles, feed on damaged, overripe, or decomposing fruits and vegetables. Occasionally, after being drawn to and feeding on damaged or decomposing produce, they will also feed on intact fruits and vegetables. They frequently leave deep holes in the fruits and vegetables they feed on, and these holes closely resemble holes made by slugs. The University of Minnesota Extension program identifies sanitation as the best method to manage sap beetles in home gardens. The program also notes that pesticides are not very effective for managing this pest, and recommends against using them for sap beetle control. As an alternative management option, bait traps can be set out, using overripe fruit or other materials as bait.
