Grain Beetles Control & Removal Guide
(Red flour beetle, Confused flour beetle, Rusty grain beetle)*Tribolium castaneum* / *Cryptolestes ferrugineus*
How They Get In
- Bagged flour and grain may carry eggs from factories.
- Beetles hide in cardboard and cabinet crevices.
- They spread through pipe shafts in multi-unit buildings.
- Unsealed grain attracts beetles.
How to Get Rid of Them
- Pre-Treatment: Discard caked, infested flour. Transfer sound grain to sealed containers. Vacuum cabinet bottoms.;
- Key Zones: Cabinet joints, cardboard edges, baseboards.;
- Application: Spray crevices in lines. Never on grain.;
- Post-Treatment: Close 1-2 hours, ventilate. Seal and discard infested material.;
- Prevention: Use sealed containers, clean cabinets regularly, freeze new flour.
Prevention & Follow-Up
Store grains in sealed glass jars or airtight plastic containers — don't use cardboard boxes for long-term storage. Keep your pantry and storage areas dry and well-ventilated. Regularly sweep up flour dust, crumbs, and grain debris from the bottom and corners of shelves. Buy grains in small amounts and restock often to shorten storage time. If you find grain beetles, clean out the entire pantry and throw away any grain products that are caked together or infested. Freeze newly bought flour and grains for 48 hours before storing them.