Illinois Natural History Survey - University of Illinois

Picnic Beetle 

Glischrochilus quadrisignatus

Coleoptera: Nitidulidae

• The adult picnic beetle is black with four yellow irregular spots, and about 3/16" long. (a)

• Beetles feed on the ripening fruits of strawberry. 
• Beetles feed on overripe and damaged fruits and vegetables including sweet corn ears and the fruit of tomato, apricot, and peach. (b) 
• Beetles tunnel through fruit, leaving feces, and subsequent bacterial and fungal infections.

• Harvest ripening fruit promptly and remove damaged or rotting fruit that attracts these beetles. 
• Avoid peeking into ripening sweet corn ears because disturbed husks allow easier beetle attack. 
• Pile damaged fruit away from the garden to attract beetles.

Other Information 
• Beetles are more numerous near forested areas, where their larvae live. 
• Cooking odors will attract these beetles to food indoors. 

Illinois Natural History Survey

1816 South Oak Street, MC 652
Champaign, IL 61820

Terms of use. Email the Web Administrator with questions or comments.

© 2015 University of Illinois Board of Trustees. All rights reserved.
For permissions information, contact the Illinois Natural History Survey.

Staff Intranet