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How to identify it
- About 1/10 to 1/8 inch long, light to reddish brown, cylindrical and humpbacked, covered in fine silky hairs.[2][1][5]
- Wing covers have rows of lengthwise grooves; the antennae end in three enlarged segments.[2][1][5]
- Seen from above, the head is hidden under the hood-like pronotum, as in the cigarette beetle.[5][6]
- Penn State describes active adults as quick, with a skittering run; UGA notes they may play dead when disturbed.[2][5]
Look-alikes
Where it lives
Infests almost any dry plant or animal product: flour, bread, breakfast foods, seeds, spices such as red pepper, pet food, drugs and leather goods.[1][3]
Biology and life cycle
Females lay eggs singly in dry organic material; eggs hatch in 6 to 10 days and the grubs tunnel through the food.[2][1]
Larvae go through six to nine instars, reach about 2/10 inch, and pupate in a small cocoon of silk and food particles.[2]
The life cycle can take less than two months (about 40 to 50 days).[1][2]
Penn State adds that despite that short cycle, there is generally only one generation a year in stored grain.[2]
Adults fly and are attracted to light.[3][5][6]
Adults are short-lived and feed little or not at all.[5]
Damage and signs
- Larvae and adults contaminate food; infested packages should be discarded.[1]
- In homes UGA finds them in dried herbs and spices, dry pet food and dog treats, rodent bait, dried flowers, books and taxidermy mounts; UK adds bread, flour, breakfast foods and red pepper.[5][3]
- Adults can chew through paperboard boxes, bags and aluminum foil, and they leave small round holes where they emerge from an infested item.[5]
- On farms, Penn State says, it is not a major pest of stored grain but does turn up in grain bins from time to time.[2]
Health risk
The harm is contamination of stored food.[1]
Control
Prevention
Store dry foods in tight-lidded containers, keep storage dry, and keep rarely used items in the freezer.[1][6]
Sanitation
Find and discard all infested items, including spices, pet food and decorative dried items; vacuum shelves with a crevice tool and wash them.[3][1][6]
Because adults fly to windows and lights, the ones you see may be well away from the source, and UGA says a wider search may be needed, including non-food items such as dried arrangements, books and mounts.[5]
Traps and physical control
Decorative dried items or bird seed can be frozen at 0°F for 4 days.[3]
UGA's figure for freezing keepsakes and décor is six days at 0 to -2°F, and Illinois gives 3 to 7 days at 27°F or colder for lightly infested food. UGA notes that results depend on the temperature reached inside the item and how well it insulates the insects.[5][6]
Pesticides
Insecticides aren't recommended for pantry pests.[1]
UGA says insecticides may cut down visible adults but won't end an infestation unless the infested material is removed, and they should never be applied to food. Illinois adds that any food an insecticide touches must be thrown away.[5][6]
Common questions
- How do I tell drugstore beetles from cigarette beetles?
- Look at the wing covers with a magnifier: drugstore beetles have lengthwise grooves; cigarette beetles are smooth.[1][2][5]
- Why are tiny brown beetles on my windowsill?
- Drugstore and cigarette beetles both fly and are attracted to light, so they often gather at windows away from the food they came from. Check spices, pet food and dried decorations.[3][6][5]
Sources
- University of California Statewide IPM Program, “Pest Notes: Pantry Pests, Publication 7452 (March 2013).” ipm.ucanr.edu/legacy_assets/PDF/PESTNOTES/pnpantrypests.pdf (accessed 2026-11-11)
- Penn State Extension, “Drugstore Beetle.” extension.psu.edu/drugstore-beetle (accessed 2026-11-11)
- University of Kentucky Entomology, “ENTFACT-612: Stored Product Pests in the Pantry.” entomology.mgcafe.uky.edu/ef612 (accessed 2026-11-11)
- iNaturalist, “Stegobium paniceum taxon page (order and family).” www.inaturalist.org/taxa/231494 (accessed 2026-11-11)
- University of Georgia Cooperative Extension, “Bulletin 1378: Stored Product Pests in the Home (Suiter, Toews and Ames).” fieldreport.caes.uga.edu/publications/B1378/ (accessed 2026-11-11)
- University of Illinois Extension, “Common Pantry Pests.” extension.illinois.edu/sites/default/files/common_pantry_pests.pdf (accessed 2026-11-11)
- Clemson Cooperative Extension Home & Garden Information Center, “HGIC 2413: Cigarette Beetles.” hgic.clemson.edu/factsheet/cigarette-beetles/ (accessed 2026-11-11)