Photo: Udo Schmidt from Deutschland, CC BY-SA 2.0, via Wikimedia Commons
Kansas City Pest Identification
Tribolium confusum (confused flour beetle) and T. castaneum (red flour beetle)Flour Beetle Identification
A small reddish-brown beetle that infests flour, cornmeal, cereal, and other finely milled dry goods, often in large numbers once established.
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How to Identify It
Small, flattened, oval, reddish-brown, with clubbed antennae. Can appear in large numbers quickly in an established package of flour or meal.
Size: 3–4 mm
Commonly Confused With
Grain beetles (saw-toothed thorax) and drugstore beetles.
Why It Shows Up
Arrives in an infested package of flour, cornmeal, cereal, or spices and reproduces rapidly in the finely milled material.
Where Homeowners Find It
Flour, cornmeal, cereal, pasta, and dried pet food — especially products that have been opened and stored for an extended period.
Seasonal Activity in KC
Year-round indoors.
Risk Level
Food contamination only.
What You Can Do Yourself
- • Discard infested packages and check all nearby flour and grain products.
- • Vacuum shelves and cracks thoroughly, including under shelf liners.
- • Store flour and meal in sealed containers, and don't stockpile beyond what you'll use within a few months.
What Professional Treatment Involves
Pantry inspection and monitoring, with crack-and-crevice treatment if the infestation has moved beyond the original package into cabinet structures.
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Common Questions
How do I tell a flour beetle from something that looks similar?
Grain beetles (saw-toothed thorax) and drugstore beetles.
Do I need professional treatment for flour beetle?
Pantry inspection and monitoring, with crack-and-crevice treatment if the infestation has moved beyond the original package into cabinet structures.