Laddertongue grain beetle (Red flour beetle)

Scientific Name: Tribolium castaneum

Order & Family: Order: Coleoptera; Family: Tenebrionidae

Size: 3.0 - 4.5 mm (1/8 inch) in length

Laddertongue grain beetle (Red flour beetle)

Natural Habitat

Indoor environments, particularly pantries, kitchens, grain storage facilities, and warehouses

Diet & Feeding

Scavenges on stored grain products, flour, cereal, dry pet food, nuts, and dried fruit

Behavior Patterns

Active year-round in warm indoor environments; they are nocturnal and attracted to light, often hiding in tight crevices of food packaging

Risks & Benefits

Major pantry pest that causes economic loss through food contamination; it does not bite or sting humans and is not known to spread diseases

Identified on: 1/4/2026