Sap beetles, also referred to as picnic beetles, often become a nuisance in gardens during late summer. They feed on damaged, overripe, or decomposing fruits and vegetables. There are over 180 species of sap beetles, yet the best known species in Minnesota are the strawberry sap beetle (Stelidota geminata), picnic beetle Glischrochilus quadrisignatus, and the dusky sap beetle (Carpophilus lugubris).