Tiny insects in flour are usually pantry pests such as weevils, beetles, or moths that arrived in a package or spread among dry foods. Effective control means removing infested food, inspecting nearby products, and cleaning cracks; spraying pesticide around open food adds risk without removing eggs inside packages.
Discard clearly infested food
If you see live insects, larvae, fine webbing, or heavy debris inside the flour, seal the package and remove it from the pantry. Do not sift an actively infested product in an attempt to save it.
Inspect nearby dry foods
Check rice, pasta, cereals, spices, nuts, pet food, and opened packages. Pantry pests can move through cardboard or loose closures, and the original source is not always the flour where they are first noticed.
Vacuum shelves and cracks and discard the vacuum contents
Remove crumbs, flour dust, and cocoons from corners and shelf holes. Clean with compatible soapy water and empty the vacuum outside so insects are not returned to the pantry.
Store vulnerable foods in sealed containers
Rigid containers with tight seals limit spread and make future infestations easier to spot. Do not apply insecticides to food, utensils, or food-contact surfaces unless a legal product is specifically labeled for that use.
Sources
- U.S. Environmental Protection Agency (EPA) — Integrated Pest Management — Integrated pest management using sanitation, exclusion, monitoring, and targeted control.