Rice Weevils Control & Removal Guide
(Snout weevil, Grain weevil, Maize weevil)*Sitophilus oryzae* / *Sitophilus zeamais*
How They Get In
- Bulk rice and grains from stores carry eggs inside kernels, invisible externally.
- Residual eggs in old rice bins cross-contaminate new grain.
- Unsealed grain allows adult weevils to fly in from crevices.
- Grain pests from hallways crawl through gaps into kitchens.
How to Get Rid of Them
- Pre-Treatment: Discard heavily infested grain. Transfer sound grain to sealed containers. Vacuum cabinet interiors.;
- Key Zones: Cabinet joints, rice container exteriors, storage corners, baseboards.;
- Application: Spray cabinet joints in lines. Never spray on grain.;
- Post-Treatment: Close cabinets 1-2 hours, ventilate. Freeze infested grain at -18 C for 48 hours.;
- Prevention: Buy small quantities, use sealed containers, keep new and old separate, inspect monthly.
Prevention & Follow-Up
Buy grains in small amounts and restock more often. In summer, don't buy more than two weeks' worth at a time. Transfer all rice, flour, and miscellaneous grains into sealed glass jars or airtight rice bins right after purchase — never store them in open containers or cardboard boxes. Place food-grade silica gel desiccant packs in your pantry to keep the storage area dry. Check your grains regularly; if you find adult weevils or damaged kernels, isolate and throw them away immediately. Store new grains and old grains in separate containers to prevent cross-infestation.