Scientific name: Tribolium castaneum Family: Tenebrionidae Order: Coleoptera Risk level: Very high Category: Beetle
? What is the red flour beetle
Scientific name: Tribolium castaneum
Family: Tenebrionidae
Order: Coleoptera
Risk level: Very high
Category: Beetle
The red flour beetle (Tribolium castaneum) is the most common and widespread flour beetle worldwide. It is shiny reddish brown and measures 3–4 mm. It has high genetic resistance to many pesticides and releases chemical secretions (quinones) that discolor flour and give it an unpleasant taste and odor.
Life cycle of the red flour beetle
It undergoes complete metamorphosis. Eggs are laid directly on food, and the larva is the damaging stage. A full generation takes 4–8 weeks. Multiple generations may breed in an infested warehouse.
Distribution of the red flour beetle
It occurs in food warehouses worldwide and is common in the Gulf, Saudi Arabia and Egypt, especially in hot warehouses.
Damage and risks associated with the red flour beetle
It releases quinones that turn flour brown and change its taste and odor. The beetle, its eggs and droppings contaminate milled products.
Signs of a red flour beetle infestation
Signs include adult insects around light sources; larvae and silken threads in food (moths); droppings and hollow grains caused by weevils and beetles; and small white eggs on food.
Where red flour beetles are found
They infest flour, bran, animal feed, nuts, spices and other milled products.
Red flour beetle control methods
Monitor with pheromone traps. Spray the warehouse with pyrethroids. Fumigate stored products with phosphine or methyl bromide. For physical control, lower the temperature below 10°C or raise it above 55°C. Rotate stock using FIFO.
Red flour beetle control products
Pyrethroids for warehouses, phosphine (PH₃) for fumigation, deltamethrin for residual spraying and diatomaceous earth for grain.
Requirements for controlling red flour beetles in food facilities
FSSC 22000 Version 7: stored-product pests are high priority. Pheromone traps with weekly documentation are mandatory. BRCGS: stored-product pests in a product constitute a major Non-Conformance.
A fact about the red flour beetle
Tribolium castaneum is one of the most studied invertebrates. It is used as a research model for cancer, development and genomics.
Frequently asked questions about the red flour beetle
Q: How do stored-product pests enter a facility?
A: Usually through incoming shipments. Carefully inspect samples from each shipment and quarantine new purchases.
Q: Is a low temperature enough to eliminate stored-product pests?
A: Yes. Temperatures below 10°C for two weeks stop reproduction and kill vulnerable stages. Temperatures below −18°C for three days kill all stages
