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Red Flour Beetle (Tribolium castaneum)
Identify it, prevent it, and know when to call. A South Florida guide from Pro-Spray.
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What Is the Red Flour Beetle?
Red flour beetles are among the most common pests of stored grain products worldwide. They feed on flour and broken grains rather than whole kernels. Heavy infestations can give flour a grayish tint and a bad smell from chemicals the beetles release, and adults can fly, which helps them spread.
How to Identify Them
Look for a small, flat, shiny reddish beetle. The tip of each antenna ends in a three-segment club. The confused flour beetle looks almost the same; treatment is identical.
The South Florida Season
Flour beetles are active year-round indoors here, because our kitchens stay warm in every month. Problems often show up after holiday baking, when large bags of flour and mixes sit open for weeks, or when bulk pet food is stored in the garage, where heat speeds up their development.
Life Cycle
Females lay eggs loose in flour and similar products. The slender yellowish larvae feed and grow, then pupate right in the food, and adults can live for many months. Warm temperatures speed up every stage, so kitchens without steady AC can see quick buildups.
Look-alikes and How to Tell Them Apart
- Confused flour beetle: nearly identical; antennae widen gradually instead of ending in a sharp three-segment club.
- Sawtoothed grain beetle: narrower, with saw-like teeth on the sides of the thorax.
- Drugstore beetle: rounder and humped, with the head tucked under.
- Rice weevil: has a long snout.
Where They Hide in South Florida Homes
In flour, cake and pancake mixes, cereal, crackers, spices, pet food and bird seed; in cracks and corners of pantry shelves; under appliances where flour spills collect; and in old, forgotten baking supplies.
When to Call a Pro
Call if beetles keep returning after you've removed the infested products and cleaned, or if you find them in several places around the kitchen. We'll help track down the source and treat the cracks and crevices they hide in.
Signs of Red Flour Beetles
- Beetles crawling in flour or mixes, or on shelves
- Flour that looks gray or smells sour
- Small yellowish-white larvae in dry goods
Is it dangerous?
- Contamination
Contaminated food with a sharp, unpleasant odor.
Prevention Tips
- Keep flour and mixes in sealed containers, and buy only what you'll use soon.
- Clean spilled flour from shelf corners and the toaster or mixer areas.
- Check pet food and bird seed storage.
- Freezing new flour for a few days can help.
How Pro-Spray Treats Red Flour Beetles
We help find and remove the infested products, then treat pantry cracks and crevices (with food removed), set monitoring traps and check nearby storage. No food is sprayed. Our Bug Free Guarantee: If pests come back between visits, so do we, at no extra cost.
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+ FREE inspection
Then stay protected with our $125 quarterly pest control plan, about $42/month.
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Frequently Asked Questions
Why does my flour smell bad?
Can flour beetles chew through packaging?
Do flour beetles bite?
Reviewed October 2026 by Pro-Spray's family-run team
Pests don't wait.
Protect your home today.
Get $50 OFF your first pest service and a FREE inspection & estimate. Ongoing protection is $125 quarterly (about $42/month), with no contracts and no cancellation fees.
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