Also known as: Oryzaephilus mercator
Description & Identification
The merchant grain beetle is a common stored product pest found worldwide, including throughout Canada. It thrives in packaged grains, dried fruits, tobacco, and often infests dry pantry goods in homes.
- Size: About 3 mm in length
- Colour: Brown
- Shape: Slender body
Adults closely resemble sawtoothed grain beetles but can be distinguished by the width of the temple—wider in sawtoothed grain beetles. Larvae are white to pale yellow and flattened.
Signs of a Merchant Grain Beetle Infestation
Signs include:
- Adult beetles crawling near stored products or pantry shelves
- Visible entry and exit holes in improperly sealed or stored food packages
How to Remove Merchant Grain Beetles
Infested pantry items can be treated by:
- Heating to 58°C for one hour
- Or freezing at -18°C for six days
Clean and vacuum contaminated areas thoroughly. For persistent infestations or large-scale problems, contact a professional pest control service for effective treatment and removal.
How to Prevent Merchant Grain Beetles
- Inspect dry goods carefully before purchase.
- Report any infested products to the store or supermarket.
- Store grains and cereals in airtight containers made of glass, metal, or durable plastic.